Initial import of verae-middleware from zapier monorepo

2026-09-11 14:59:27 -04:00 · 2026-09-11 14:59:27 -04:00 · 0c807706f3
commit 0c807706f3
67 changed files with 6630 additions and 0 deletions
--- a/.env.example
+++ b/.env.example
@ -0,0 +1,35 @@
+# HTTP
+PORT=3100
+HOST=0.0.0.0
+
+# Upstream Verae
+VERAE_API_BASE_URL=https://api.veraetime.net
+MOCK_VERAE=false
+
+# NATS (Phase 7+)
+# NS1 JetStream is 127.0.0.1:4222 on 70.88.205.138 (not public).
+# Tunnel: ssh -fN -L 14222:127.0.0.1:4222 marchon@70.88.205.138
+# then NATS_URL=nats://127.0.0.1:14222
+NATS_ENABLED=false
+NATS_URL=nats://127.0.0.1:4222
+WAIT_TIMEOUT_MS=25000
+MOCK_JOB_COMPLETE_MS=150
+
+# Security
+TOKEN_SECRET=change-me-in-production
+ADMIN_SECRET=change-me-admin
+
+# Job polling
+JOB_POLL_INTERVAL_MS=2000
+JOB_POLL_MAX_ATTEMPTS=60
+
+# Store
+STORE_PATH=./data/store.json
+
+# Billing UX
+UPGRADE_URL=https://veraetime.net/billing
+
+# Runtime debug (see docs/developer/debugging.md)
+# DEBUG_VERAE=auth,nats,jobs,webhooks,http,billing
+# DEBUG_VERAE_LEVEL=debug
+# DEBUG_VERAE_FILE=/tmp/verae-zapier-debug.log
--- a/8
+++ b/8
@ -0,0 +1,8 @@
+FROM node:22-alpine
+WORKDIR /app
+COPY package.json ./
+RUN npm install --omit=dev
+COPY src ./src
+ENV PORT=3100
+EXPOSE 3100
+CMD ["node", "src/index.js"]
--- a/NATS.md
+++ b/NATS.md
@ -0,0 +1,9 @@
+# NATS — verae-middleware
+
+| Direction | Address | Peer | Body |
+|-----------|---------|------|------|
+| OUT | `verae.zapier.jobs.watch` | job-poller | job watch payload |
+| IN | `verae.zapier.jobs.events` | waiter | terminal status |
+| OUT | (via aggregator) `verae.archive.query` | WORM | attached lookup |
+
+HTTP remains the only Zapier-facing surface.
--- a/README.md
+++ b/README.md
@ -0,0 +1,40 @@
+# verae-middleware
+
+Zapier-facing HTTPS adapter (`/zapier/v1/*`) plus NATS workers. Zapier never speaks NATS or `api.veraetime.net`; this process does.
+
+**Forgejo:** https://git.georgelambert.org/marchon/verae-middleware  
+**Clone:** `ssh://git@git.georgelambert.org:2223/marchon/verae-middleware.git`  
+**Catalog README (PDF):** https://zapier.georgelambert.org/packages/verae-zapier-middleware/README.pdf  
+**NATS contract:** https://zapier.georgelambert.org/docs-master/modules/verae-zapier-middleware/NATS.pdf  
+**Install / Docker / Proxmox:** https://zapier.georgelambert.org/packages/verae-ops/README.pdf
+
+## Run
+
+```bash
+cd packages/verae-zapier-middleware
+npm install
+MOCK_VERAE=true NATS_ENABLED=false npm test
+PORT=3100 MOCK_VERAE=true npm start   # /health, /zapier/v1
+```
+
+Docker image: `Dockerfile` (Node 22, port 3100). Full stack: `verae-ops` compose.
+
+## Environment
+
+| Variable | Default | Purpose |
+|----------|---------|---------|
+| `PORT` | `3100` | HTTP bind |
+| `VERAE_API_BASE_URL` | `http://localhost:8080` | Chain HTTPS |
+| `MOCK_VERAE` | `false` | In-process mock chain |
+| `NATS_ENABLED` | `false` | JetStream vs in-process poller |
+| `NATS_URL` | `nats://127.0.0.1:4222` | Cluster URL (loopback / docker DNS) |
+| `WAIT_TIMEOUT_MS` | — | Sync wait on `jobs.events` |
+
+## Depends on
+
+- **Upstream HTTPS:** zappier-edge (`x-api-key` already checked) or a lab client
+- **Chain:** `api.veraetime.net` or `MOCK_VERAE=true`
+- **NATS:** `jobs.watch` out, `jobs.events` in; optional `archive.put` / aggregator wait
+- **Optional:** request-splitter (in-process), archive-worm, tree-node, webhook-deliver
+
+Does **not** bind NATS publicly. See [verae-ops linking](https://zapier.georgelambert.org/packages/verae-ops/06-linking-services.pdf).
--- a/SUMMARY.md
+++ b/SUMMARY.md
@ -0,0 +1,15 @@
+# verae-middleware (HTTP edge)
+
+**Job:** Public `/zapier/v1/*`. Auth, entitlements, timestamp/wait, hash lookup, objects, receipts. Publishes NATS jobs; waits on events.
+
+**Expects HTTPS from:** zappier-edge (or Zapier if pointed here).
+
+**Sends:**
+- HTTPS to verae-chain-client (`/api/timestamp`, `/api/status`, `/api/verify`)
+- `verae.zapier.jobs.watch` after create
+- waits `verae.zapier.jobs.events`
+- splitter + aggregator when attachments / `includeAttached`
+
+**Returns to requestor:** 202 `{ jobId }` or wait JSON (completed / pending+jobId).
+
+**NATS:** never exposed to Zapier.
--- a/package-lock.json
+++ b/package-lock.json
@ -0,0 +1,864 @@
+{
+  "name": "verae-zapier-middleware",
+  "version": "0.1.0",
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+      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/tweetnacl": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-1.0.3.tgz",
+      "integrity": "sha512-6rt+RN7aOi1nGMyC4Xa5DdYiukl2UWCbcJft7YhxReBGQD7OAM8Pbxw6YMo4r2diNEA8FEmu32YOn9rhaiE5yw==",
+      "license": "Unlicense"
+    },
+    "node_modules/type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "license": "MIT",
+      "dependencies": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    }
+  }
+}
--- a/package.json
+++ b/package.json
@ -0,0 +1,39 @@
+{
+  "name": "verae-zapier-middleware",
+  "version": "0.1.0",
+  "description": "HTTP edge + NATS workers bridging Zapier and api.veraetime.net",
+  "type": "module",
+  "main": "src/index.js",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "node --watch src/index.js",
+    "test": "MOCK_VERAE=true NATS_ENABLED=false node --test test/unit/**/*.test.js test/integration/auth.test.js test/integration/http-api.test.js",
+    "test:unit": "MOCK_VERAE=true NATS_ENABLED=false node --test test/unit/**/*.test.js",
+    "test:gate1": "node --test test/unit/debug.test.js",
+    "test:gate2": "MOCK_VERAE=true node --test test/unit/config.test.js test/unit/app.test.js",
+    "test:gate3": "MOCK_VERAE=true NATS_ENABLED=false node --test test/unit/store.test.js",
+    "test:gate4": "MOCK_VERAE=true NATS_ENABLED=false node --test test/unit/tokens.test.js test/unit/veraeClient.test.js",
+    "test:gate5": "MOCK_VERAE=true NATS_ENABLED=false node --test test/integration/auth.test.js",
+    "test:gate6": "MOCK_VERAE=true NATS_ENABLED=false JOB_POLL_INTERVAL_MS=20 JOB_POLL_MAX_ATTEMPTS=50 node --test test/integration/http-api.test.js",
+    "test:gate7": "MOCK_VERAE=true NATS_ENABLED=true NATS_FORCE_CONNECT=1 NATS_URL=nats://127.0.0.1:4222 node --test test/integration/nats.test.js",
+    "test:gate8": "MOCK_VERAE=true NATS_ENABLED=true NATS_FORCE_CONNECT=1 NATS_URL=nats://127.0.0.1:4222 JOB_POLL_INTERVAL_MS=50 node --test test/integration/nats-workers.test.js",
+    "test:gate9": "MOCK_VERAE=true NATS_ENABLED=true NATS_FORCE_CONNECT=1 NATS_URL=nats://127.0.0.1:4222 JOB_POLL_INTERVAL_MS=40 WAIT_TIMEOUT_MS=8000 node --test test/integration/wait-nats.test.js",
+    "test:gate10": "MOCK_VERAE=true NATS_ENABLED=false node --test test/integration/tenants.test.js",
+    "test:hash": "MOCK_VERAE=true NATS_ENABLED=false node --test test/integration/hash.test.js"
+  },
+  "engines": {
+    "node": ">=22.0.0"
+  },
+  "dependencies": {
+    "express": "^4.21.2",
+    "nats": "^2.28.2"
+  },
+  "keywords": [
+    "verae",
+    "zapier",
+    "middleware",
+    "nats",
+    "timestamping"
+  ],
+  "license": "UNLICENSED"
+}
--- a/src/app.js
+++ b/src/app.js
@ -0,0 +1,55 @@
+/**
+ * @fileoverview Express application factory for the Zapier-facing HTTP edge.
+ * @module app
+ */
+
+import express from 'express';
+import { sendError } from './errors.js';
+import { createDebugger } from './debug/logger.js';
+import { traceMiddleware } from './debug/trace.js';
+import { apiRoutes } from './routes/index.js';
+import { loadStore } from './store/db.js';
+import { config } from './config.js';
+import { isNatsConnected } from './nats/connection.js';
+
+const log = createDebugger('app');
+
+/**
+ * Create the Express app (does not listen).
+ *
+ * @param {{ load?: boolean }} [options]
+ * @returns {import('express').Express}
+ */
+export function createApp(options = {}) {
+  if (options.load !== false) {
+    loadStore();
+  }
+
+  const app = express();
+  app.disable('x-powered-by');
+
+  app.use(express.json({ limit: '12mb' }));
+  app.use(traceMiddleware);
+
+  /**
+   * Liveness probe.
+   */
+  app.get('/health', (_req, res) => {
+    res.json({
+      status: 'ok',
+      service: 'verae-zapier-middleware',
+      mockVerae: config.mockVerae,
+      natsEnabled: config.natsEnabled,
+      natsConnected: isNatsConnected(),
+    });
+  });
+
+  app.use('/zapier', apiRoutes);
+
+  app.use((err, _req, res, _next) => {
+    sendError(res, err);
+  });
+
+  log.info('express app created');
+  return app;
+}
--- a/src/clients/veraeClient.js
+++ b/src/clients/veraeClient.js
@ -0,0 +1,351 @@
+/**
+ * @fileoverview HTTP client for api.veraetime.net (with mock mode).
+ * @module clients/veraeClient
+ */
+
+import { createHash, randomUUID } from 'node:crypto';
+import { config } from '../config.js';
+import { AppError } from '../errors.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('http');
+
+const mockJobs = new Map();
+/** @type {Map<string, { jobId: string, sha256: string, timestamp?: string, publicMetadata?: object, privateMetadata?: object }>} */
+const mockHashes = new Map();
+
+/**
+ * @param {string} data
+ * @returns {string}
+ */
+export function sha256Hex(data) {
+  return createHash('sha256').update(String(data), 'utf8').digest('hex');
+}
+
+/**
+ * @param {number} ms
+ * @returns {Promise<void>}
+ */
+function delay(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+async function mockLogin({ username, password }) {
+  if (!username || !password) {
+    throw new AppError('Invalid credentials', { status: 401, code: 'UNAUTHORIZED' });
+  }
+  const expiresAt = new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString();
+  return {
+    token: `mock-jwt-${username}`,
+    expiresAt,
+    user: {
+      id: randomUUID(),
+      username,
+      role: username.includes('admin') ? 'admin' : 'user',
+    },
+  };
+}
+
+async function mockValidate(token) {
+  if (!token?.startsWith('mock-jwt-')) {
+    throw new AppError('Invalid or expired token', { status: 401, code: 'UNAUTHORIZED' });
+  }
+  const username = token.replace('mock-jwt-', '');
+  return {
+    valid: true,
+    userId: randomUUID(),
+    username,
+    role: 'user',
+    expiresAt: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
+  };
+}
+
+async function mockCreateTimestamp({ data, hashAlg, sha256, publicMetadata, privateMetadata }) {
+  if (!data && !sha256) {
+    throw new AppError('Invalid input data', { status: 400, code: 'VALIDATION_ERROR' });
+  }
+  const key = (sha256 || sha256Hex(data)).toLowerCase();
+  const existing = mockHashes.get(key);
+  if (existing) {
+    const job = mockJobs.get(existing.jobId);
+    return {
+      jobId: existing.jobId,
+      sha256: key,
+      existing: true,
+      timestamp: job?.completedAt ?? existing.timestamp,
+    };
+  }
+
+  const jobId = randomUUID();
+  mockJobs.set(jobId, {
+    id: jobId,
+    status: 'pending',
+    createdAt: Date.now(),
+    data: data ?? key,
+    hashAlg: hashAlg ?? 'SHA256',
+    sha256: key,
+    publicMetadata: publicMetadata ?? {},
+    privateMetadata: privateMetadata ?? {},
+  });
+  mockHashes.set(key, { jobId, sha256: key, publicMetadata, privateMetadata });
+
+  const delayMs = config.mockJobCompleteMs ?? 150;
+  setTimeout(() => {
+    const job = mockJobs.get(jobId);
+    if (!job) return;
+    job.status = 'completed';
+    job.result = `mock-cert-${jobId}`;
+    job.completedAt = new Date().toISOString();
+    job.metadata = {
+      blockIndex: 42,
+      timestamp: job.completedAt,
+      certificate: job.result,
+      sha256: key,
+      publicMetadata: job.publicMetadata,
+    };
+    const rec = mockHashes.get(key);
+    if (rec) rec.timestamp = job.completedAt;
+  }, delayMs);
+
+  return { jobId, sha256: key, existing: false };
+}
+
+async function mockGetStatus(jobId) {
+  const job = mockJobs.get(jobId);
+  if (!job) {
+    throw new AppError('Job not found', { status: 404, code: 'NOT_FOUND' });
+  }
+  return {
+    id: job.id,
+    status: job.status,
+    result: job.result,
+    completedAt: job.completedAt,
+    metadata: job.metadata,
+    privateMetadata: job.privateMetadata,
+    error: job.error,
+    sha256: job.sha256,
+  };
+}
+
+async function mockLookupHash(sha256) {
+  const key = String(sha256 || '').toLowerCase();
+  const rec = mockHashes.get(key);
+  if (!rec) {
+    throw new AppError('Hash not found', { status: 404, code: 'NOT_FOUND' });
+  }
+  const job = mockJobs.get(rec.jobId);
+  return {
+    sha256: key,
+    exists: true,
+    jobId: rec.jobId,
+    timestamp: rec.timestamp ?? job?.completedAt,
+    status: job?.status,
+    publicMetadata: job?.publicMetadata ?? rec.publicMetadata ?? {},
+  };
+}
+
+async function mockVerify({ certificate }) {
+  if (!certificate) {
+    throw new AppError('Invalid input data', { status: 400, code: 'VALIDATION_ERROR' });
+  }
+  const valid = certificate.startsWith('mock-cert-') || certificate.startsWith('eyJ');
+  return valid
+    ? { valid: true, timestamp: new Date().toISOString(), blockIndex: 42 }
+    : { valid: false };
+}
+
+/**
+ * Low-level fetch to Verae API.
+ * @param {string} path
+ * @param {{ method?: string, token?: string, body?: unknown }} [options]
+ * @returns {Promise<any>}
+ */
+async function request(path, { method = 'GET', token, body } = {}) {
+  const url = `${config.veraeApiBaseUrl}${path}`;
+  const headers = { Accept: 'application/json' };
+
+  if (token) {
+    headers.Authorization = `Bearer ${token}`;
+  }
+  if (body !== undefined) {
+    headers['Content-Type'] = 'application/json';
+  }
+
+  const started = Date.now();
+  log.debug('verae request', { method, path, hasToken: Boolean(token) });
+
+  const response = await fetch(url, {
+    method,
+    headers,
+    body: body !== undefined ? JSON.stringify(body) : undefined,
+  });
+
+  let payload = null;
+  const text = await response.text();
+  if (text) {
+    try {
+      payload = JSON.parse(text);
+    } catch {
+      payload = { error: text };
+    }
+  }
+
+  log.debug('verae response', {
+    method,
+    path,
+    status: response.status,
+    durationMs: Date.now() - started,
+  });
+
+  if (!response.ok) {
+    throw new AppError(payload?.error ?? `Verae API error (${response.status})`, {
+      status: response.status,
+      code: payload?.code ?? 'VERAE_API_ERROR',
+      details: payload,
+    });
+  }
+
+  return payload;
+}
+
+/**
+ * Verae API client (mock when config.mockVerae is true).
+ */
+export const veraeClient = {
+  /**
+   * @param {{ username: string, password: string }} credentials
+   */
+  async login(credentials) {
+    if (config.mockVerae) return mockLogin(credentials);
+    return request('/auth/login', { method: 'POST', body: credentials });
+  },
+
+  /**
+   * @param {string} token
+   */
+  async validate(token) {
+    if (config.mockVerae) return mockValidate(token);
+    return request('/auth/validate', { token });
+  },
+
+  /**
+   * @param {string} token
+   * @param {{ data: string, hashAlg?: string }} body
+   */
+  async createTimestamp(token, body) {
+    if (config.mockVerae) return mockCreateTimestamp(body);
+    const liveBody = { data: body.data, hashAlg: body.hashAlg };
+    return request('/api/timestamp', { method: 'POST', token, body: liveBody });
+  },
+
+  /**
+   * @param {string} token
+   * @param {string} sha256
+   */
+  async lookupHash(token, sha256) {
+    if (config.mockVerae) return mockLookupHash(sha256);
+    throw new AppError('Hash lookup is not on the live Verae OpenAPI', {
+      status: 501,
+      code: 'NOT_IMPLEMENTED',
+    });
+  },
+
+  /**
+   * @param {string} token
+   * @param {{ items: Array<{ data: string, hashAlg?: string }> }} body
+   */
+  async createBatchTimestamp(token, body) {
+    if (config.mockVerae) {
+      const jobIds = [];
+      for (const item of body.items ?? []) {
+        const res = await mockCreateTimestamp(item);
+        jobIds.push(res.jobId);
+      }
+      return { jobIds };
+    }
+    return request('/api/batch/timestamp', { method: 'POST', token, body });
+  },
+
+  /**
+   * @param {string} token
+   * @param {string} jobId
+   */
+  async getStatus(token, jobId) {
+    if (config.mockVerae) return mockGetStatus(jobId);
+    return request(`/api/status/${encodeURIComponent(jobId)}`, { token });
+  },
+
+  /**
+   * @param {string} token
+   * @param {{ jobIds: string[] }} body
+   */
+  async getBatchStatus(token, body) {
+    if (config.mockVerae) {
+      const results = {};
+      for (const jobId of body.jobIds ?? []) {
+        results[jobId] = await mockGetStatus(jobId);
+      }
+      return { results };
+    }
+    return request('/api/batch/status', { method: 'POST', token, body });
+  },
+
+  /**
+   * @param {string} token
+   * @param {{ certificate: string }} body
+   */
+  async verify(token, body) {
+    if (config.mockVerae) return mockVerify(body);
+    return request('/api/verify', { method: 'POST', token, body });
+  },
+
+  /**
+   * @param {string} token
+   * @param {{ certificates: string[] }} body
+   */
+  async verifyBatch(token, body) {
+    if (config.mockVerae) {
+      const results = [];
+      for (const certificate of body.certificates ?? []) {
+        results.push(await mockVerify({ certificate }));
+      }
+      return { results };
+    }
+    return request('/api/batch/verify', { method: 'POST', token, body });
+  },
+
+  /**
+   * @param {string} token
+   * @param {string} jobId
+   */
+  async getJobVerification(token, jobId) {
+    if (config.mockVerae) return mockGetStatus(jobId);
+    return request(`/api/verify/${encodeURIComponent(jobId)}`, { token });
+  },
+
+  /**
+   * Poll until completed/failed or timeout.
+   * @param {string} token
+   * @param {string} jobId
+   * @param {{ maxAttempts: number, intervalMs: number }} options
+   */
+  async waitForJob(token, jobId, { maxAttempts, intervalMs }) {
+    for (let attempt = 0; attempt < maxAttempts; attempt += 1) {
+      const status = await this.getStatus(token, jobId);
+      if (status.status === 'completed' || status.status === 'failed') {
+        return status;
+      }
+      await delay(intervalMs);
+    }
+    throw new AppError(`Job ${jobId} timed out`, { status: 504, code: 'GATEWAY_TIMEOUT' });
+  },
+};
+
+/**
+ * Clear mock jobs (tests only).
+ * @returns {void}
+ */
+export function clearMockJobs() {
+  mockJobs.clear();
+  mockHashes.clear();
+}
--- a/src/config.js
+++ b/src/config.js
@ -0,0 +1,144 @@
+/**
+ * @fileoverview Process configuration for the Verae Zapier middleware.
+ * @module config
+ *
+ * Loads optional `.env` then exports typed settings used by HTTP, NATS, and workers.
+ */
+
+import { readFileSync, existsSync } from 'node:fs';
+import { resolve, dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { createDebugger } from './debug/logger.js';
+
+const log = createDebugger('app');
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const rootDir = resolve(__dirname, '..');
+
+/**
+ * Load KEY=VALUE pairs from `.env` without overriding existing process.env keys.
+ * @returns {void}
+ */
+export function loadEnvFile() {
+  const envPath = resolve(rootDir, '.env');
+  if (!existsSync(envPath)) return;
+
+  for (const line of readFileSync(envPath, 'utf8').split('\n')) {
+    const trimmed = line.trim();
+    if (!trimmed || trimmed.startsWith('#')) continue;
+    const eq = trimmed.indexOf('=');
+    if (eq === -1) continue;
+    const key = trimmed.slice(0, eq).trim();
+    const value = trimmed.slice(eq + 1).trim();
+    if (!(key in process.env)) {
+      process.env[key] = value;
+    }
+  }
+}
+
+loadEnvFile();
+
+/**
+ * @param {string|undefined} value
+ * @param {boolean} [fallback=false]
+ * @returns {boolean}
+ */
+function bool(value, fallback = false) {
+  if (value === undefined) return fallback;
+  return ['1', 'true', 'yes', 'on'].includes(String(value).toLowerCase());
+}
+
+/**
+ * @param {string|undefined} value
+ * @param {number} fallback
+ * @returns {number}
+ */
+function int(value, fallback) {
+  const parsed = Number.parseInt(value ?? '', 10);
+  return Number.isFinite(parsed) ? parsed : fallback;
+}
+
+/**
+ * Runtime configuration object.
+ * @type {{
+ *   port: number,
+ *   host: string,
+ *   veraeApiBaseUrl: string,
+ *   mockVerae: boolean,
+ *   natsEnabled: boolean,
+ *   natsUrl: string,
+ *   tokenSecret: string,
+ *   jobPollIntervalMs: number,
+ *   jobPollMaxAttempts: number,
+ *   storePath: string,
+ *   upgradeUrl: string,
+ *   adminSecret: string,
+ * }}
+ */
+export const config = {
+  port: int(process.env.PORT, 3100),
+  host: process.env.HOST ?? '0.0.0.0',
+  veraeApiBaseUrl: (process.env.VERAE_API_BASE_URL ?? 'http://localhost:8080').replace(
+    /\/$/,
+    '',
+  ),
+  mockVerae: bool(process.env.MOCK_VERAE, false),
+  natsEnabled: bool(process.env.NATS_ENABLED, false),
+  natsUrl: process.env.NATS_URL ?? 'nats://127.0.0.1:4222',
+  tokenSecret: process.env.TOKEN_SECRET ?? 'dev-secret-change-me',
+  jobPollIntervalMs: int(process.env.JOB_POLL_INTERVAL_MS, 2000),
+  jobPollMaxAttempts: int(process.env.JOB_POLL_MAX_ATTEMPTS, 60),
+  waitTimeoutMs: int(process.env.WAIT_TIMEOUT_MS, 25000),
+  mockJobCompleteMs: int(process.env.MOCK_JOB_COMPLETE_MS, 150),
+  storePath: resolve(rootDir, process.env.STORE_PATH ?? './data/store.json'),
+  upgradeUrl: process.env.UPGRADE_URL ?? 'https://veraetime.net/billing',
+  adminSecret: process.env.ADMIN_SECRET ?? 'change-me-admin',
+};
+
+/**
+ * Default plan limits. `null` numeric fields mean unlimited.
+ * @type {Record<string, {
+ *   timestamps: number|null,
+ *   verifications: number|null,
+ *   batch: boolean,
+ *   batchMaxItems: number|null,
+ *   requestsPerMinute: number
+ * }>}
+ */
+export const PLAN_LIMITS = {
+  free: {
+    timestamps: 50,
+    verifications: 50,
+    batch: false,
+    batchMaxItems: 0,
+    requestsPerMinute: 30,
+  },
+  starter: {
+    timestamps: 500,
+    verifications: 500,
+    batch: true,
+    batchMaxItems: 10,
+    requestsPerMinute: 120,
+  },
+  pro: {
+    timestamps: 5000,
+    verifications: 5000,
+    batch: true,
+    batchMaxItems: 100,
+    requestsPerMinute: 600,
+  },
+  enterprise: {
+    timestamps: null,
+    verifications: null,
+    batch: true,
+    batchMaxItems: null,
+    requestsPerMinute: 3000,
+  },
+};
+
+log.info('config loaded', {
+  veraeApiBaseUrl: config.veraeApiBaseUrl,
+  mockVerae: config.mockVerae,
+  natsEnabled: config.natsEnabled,
+  natsUrl: config.natsUrl,
+  port: config.port,
+});
--- a/src/debug/config.js
+++ b/src/debug/config.js
@ -0,0 +1,106 @@
+/**
+ * @fileoverview Runtime debug configuration.
+ *
+ * Reads process environment at call time of {@link loadDebugConfig} so tests can
+ * mutate `process.env` between cases. Production servers typically load once at boot.
+ *
+ * @module debug/config
+ */
+
+/**
+ * @typedef {Object} DebugConfig
+ * @property {boolean} enabled - True when any debug output should be produced.
+ * @property {Set<string>|null} namespaces - Allowed namespaces; `null` means all.
+ * @property {'debug'|'info'|'warn'|'error'} level - Minimum severity to emit.
+ * @property {string|null} filePath - Optional secondary log file path.
+ */
+
+const LEVEL_ORDER = { debug: 10, info: 20, warn: 30, error: 40 };
+
+/**
+ * Parse `DEBUG_VERAE` into an enabled flag and optional namespace allow-list.
+ *
+ * @param {string|undefined} raw - Raw env value (e.g. `"1"`, `"*"`, `"auth,nats"`).
+ * @returns {{ enabled: boolean, namespaces: Set<string>|null }}
+ *
+ * @example
+ * parseDebugVeraeEnv('auth,jobs'); // { enabled: true, namespaces: Set{'auth','jobs'} }
+ * parseDebugVeraeEnv(undefined);   // { enabled: false, namespaces: null }
+ */
+export function parseDebugVeraeEnv(raw) {
+  if (raw === undefined || raw === null) {
+    return { enabled: false, namespaces: null };
+  }
+
+  const trimmed = String(raw).trim();
+  if (!trimmed || trimmed === '0' || trimmed.toLowerCase() === 'false' || trimmed.toLowerCase() === 'off') {
+    return { enabled: false, namespaces: null };
+  }
+
+  if (trimmed === '1' || trimmed === '*' || trimmed.toLowerCase() === 'true' || trimmed.toLowerCase() === 'all') {
+    return { enabled: true, namespaces: null };
+  }
+
+  const parts = trimmed
+    .split(',')
+    .map((p) => p.trim().toLowerCase())
+    .filter(Boolean);
+
+  if (parts.length === 0) {
+    return { enabled: false, namespaces: null };
+  }
+
+  return { enabled: true, namespaces: new Set(parts) };
+}
+
+/**
+ * Normalize a level string to a known level.
+ *
+ * @param {string|undefined} raw - Env level value.
+ * @param {'debug'|'info'|'warn'|'error'} [fallback='debug'] - Default level.
+ * @returns {'debug'|'info'|'warn'|'error'}
+ */
+export function parseLevel(raw, fallback = 'debug') {
+  const value = String(raw ?? fallback).toLowerCase();
+  if (value in LEVEL_ORDER) return /** @type {'debug'|'info'|'warn'|'error'} */ (value);
+  return fallback;
+}
+
+/**
+ * Load full debug configuration from `process.env`.
+ *
+ * Environment variables:
+ * - `DEBUG_VERAE` — enable + namespaces (see {@link parseDebugVeraeEnv})
+ * - `DEBUG_VERAE_LEVEL` — minimum level
+ * - `DEBUG_VERAE_FILE` — optional log file path
+ *
+ * @param {NodeJS.ProcessEnv} [env=process.env] - Environment map (injectable for tests).
+ * @returns {DebugConfig}
+ */
+export function loadDebugConfig(env = process.env) {
+  const { enabled, namespaces } = parseDebugVeraeEnv(env.DEBUG_VERAE);
+  return {
+    enabled,
+    namespaces,
+    level: parseLevel(env.DEBUG_VERAE_LEVEL, 'debug'),
+    filePath: env.DEBUG_VERAE_FILE ? String(env.DEBUG_VERAE_FILE) : null,
+  };
+}
+
+/**
+ * Whether a message at `messageLevel` in `namespace` should be emitted.
+ *
+ * @param {DebugConfig} config - Active config.
+ * @param {string} namespace - Logger namespace (e.g. `auth`).
+ * @param {'debug'|'info'|'warn'|'error'} messageLevel - Message severity.
+ * @returns {boolean}
+ */
+export function shouldLog(config, namespace, messageLevel) {
+  if (!config.enabled) return false;
+  if (config.namespaces && !config.namespaces.has(String(namespace).toLowerCase())) {
+    return false;
+  }
+  return LEVEL_ORDER[messageLevel] >= LEVEL_ORDER[config.level];
+}
+
+export { LEVEL_ORDER };
--- a/src/debug/index.js
+++ b/src/debug/index.js
@ -0,0 +1,24 @@
+/**
+ * @fileoverview Public exports for the runtime debug facility.
+ * @module debug
+ */
+
+export {
+  loadDebugConfig,
+  parseDebugVeraeEnv,
+  parseLevel,
+  shouldLog,
+  LEVEL_ORDER,
+} from './config.js';
+
+export { createDebugger, formatLogLine, setDebugTestSink } from './logger.js';
+
+export { redact, redactString } from './redact.js';
+
+export {
+  generateTraceId,
+  getTraceId,
+  getTraceContext,
+  withTrace,
+  traceMiddleware,
+} from './trace.js';
--- a/src/debug/logger.js
+++ b/src/debug/logger.js
@ -0,0 +1,121 @@
+/**
+ * @fileoverview Namespaced debug logger with runtime enable/disable.
+ * @module debug/logger
+ */
+
+import { appendFileSync } from 'node:fs';
+import { loadDebugConfig, shouldLog } from './config.js';
+import { redact } from './redact.js';
+import { getTraceId } from './trace-context.js';
+
+/**
+ * @typedef {Object} Debugger
+ * @property {(msg: string, meta?: Record<string, unknown>) => void} debug
+ * @property {(msg: string, meta?: Record<string, unknown>) => void} info
+ * @property {(msg: string, meta?: Record<string, unknown>) => void} warn
+ * @property {(msg: string, meta?: Record<string, unknown>) => void} error
+ * @property {string} namespace
+ */
+
+/**
+ * Optional sink for tests — when set, lines go here instead of/in addition to stderr.
+ * @type {null|((line: string) => void)}
+ */
+let testSink = null;
+
+/**
+ * Install a test sink that captures formatted log lines.
+ * Used only by unit tests; do not use in production code.
+ *
+ * @param {null|((line: string) => void)} sink - Callback or null to clear.
+ * @returns {void}
+ */
+export function setDebugTestSink(sink) {
+  testSink = sink;
+}
+
+/**
+ * Format a single log line.
+ *
+ * @param {object} parts
+ * @param {string} parts.level
+ * @param {string} parts.namespace
+ * @param {string} parts.message
+ * @param {Record<string, unknown>|undefined} parts.meta
+ * @param {string|null} parts.traceId
+ * @returns {string}
+ */
+export function formatLogLine({ level, namespace, message, meta, traceId }) {
+  const ts = new Date().toISOString();
+  const tracePart = traceId ? ` [trace=${traceId}]` : '';
+  const metaPart =
+    meta && Object.keys(meta).length > 0 ? ` ${JSON.stringify(redact(meta))}` : '';
+  return `${ts} ${level.toUpperCase()} ${namespace}${tracePart} ${message}${metaPart}`;
+}
+
+/**
+ * Emit a log line to stderr, optional file, and optional test sink.
+ *
+ * @param {string} line - Full formatted line.
+ * @param {string|null} filePath - Optional file from config.
+ * @returns {void}
+ */
+function emit(line, filePath) {
+  if (testSink) {
+    testSink(line);
+  } else {
+    // eslint-disable-next-line no-console
+    console.error(line);
+  }
+  if (filePath) {
+    try {
+      appendFileSync(filePath, `${line}\n`, 'utf8');
+    } catch {
+      // ignore file errors in debug path
+    }
+  }
+}
+
+/**
+ * Create a namespaced debugger bound to current env configuration.
+ *
+ * Configuration is re-read on every log call so tests can toggle `DEBUG_VERAE`
+ * without reloading modules. Slight cost is acceptable for debug-only paths.
+ *
+ * @param {string} namespace - Namespace such as `auth`, `nats`, `jobs`.
+ * @returns {Debugger} Logger with debug/info/warn/error methods.
+ *
+ * @example
+ * const log = createDebugger('jobs');
+ * log.debug('poll start', { jobId: 'abc' });
+ */
+export function createDebugger(namespace) {
+  const ns = String(namespace || 'app').toLowerCase();
+
+  /**
+   * @param {'debug'|'info'|'warn'|'error'} level
+   * @param {string} message
+   * @param {Record<string, unknown>} [meta]
+   */
+  function write(level, message, meta) {
+    const config = loadDebugConfig();
+    if (!shouldLog(config, ns, level)) return;
+
+    const line = formatLogLine({
+      level,
+      namespace: ns,
+      message: String(message),
+      meta,
+      traceId: getTraceId(),
+    });
+    emit(line, config.filePath);
+  }
+
+  return {
+    namespace: ns,
+    debug: (message, meta) => write('debug', message, meta),
+    info: (message, meta) => write('info', message, meta),
+    warn: (message, meta) => write('warn', message, meta),
+    error: (message, meta) => write('error', message, meta),
+  };
+}
--- a/src/debug/redact.js
+++ b/src/debug/redact.js
@ -0,0 +1,93 @@
+/**
+ * @fileoverview Secret redaction for debug logs.
+ * @module debug/redact
+ */
+
+const SENSITIVE_KEYS = new Set([
+  'password',
+  'veraepassword',
+  'token',
+  'veraetoken',
+  'accesstoken',
+  'apikey',
+  'api_key',
+  'secret',
+  'authorization',
+  'x-api-key',
+  'cookie',
+  'sessionkey',
+]);
+
+const BEARER_RE = /^Bearer\s+.+/i;
+const API_KEY_RE = /^zmw_[A-Za-z0-9_-]+/;
+const SESSION_RE = /^zmt_[A-Za-z0-9_.-]+/;
+const JWT_RE = /^eyJ[A-Za-z0-9_-]+\.[A-Za-z0-9_-]+\.[A-Za-z0-9_-]+/;
+
+/**
+ * Redact a single string value if it looks like a secret.
+ *
+ * @param {string} value - Raw string.
+ * @returns {string} Original or `[REDACTED]`.
+ */
+export function redactString(value) {
+  if (typeof value !== 'string') return value;
+  if (
+    BEARER_RE.test(value) ||
+    API_KEY_RE.test(value) ||
+    SESSION_RE.test(value) ||
+    JWT_RE.test(value)
+  ) {
+    return '[REDACTED]';
+  }
+  return value;
+}
+
+/**
+ * Deep-clone plain data structures while redacting sensitive keys and values.
+ *
+ * @param {unknown} input - Any JSON-like value.
+ * @param {number} [depth=0] - Recursion depth guard.
+ * @returns {unknown} Redacted structure safe for logging.
+ *
+ * @example
+ * redact({ password: 'x', jobId: '1' }); // { password: '[REDACTED]', jobId: '1' }
+ */
+export function redact(input, depth = 0) {
+  if (depth > 8) return '[MaxDepth]';
+
+  if (input === null || input === undefined) return input;
+
+  if (typeof input === 'string') return redactString(input);
+
+  if (typeof input === 'number' || typeof input === 'boolean') return input;
+
+  if (input instanceof Error) {
+    return { name: input.name, message: redactString(input.message), stack: undefined };
+  }
+
+  if (Array.isArray(input)) {
+    return input.map((item) => redact(item, depth + 1));
+  }
+
+  if (typeof input === 'object') {
+    /** @type {Record<string, unknown>} */
+    const out = {};
+    for (const [key, value] of Object.entries(input)) {
+      if (SENSITIVE_KEYS.has(key.toLowerCase())) {
+        out[key] = '[REDACTED]';
+      } else if (key.toLowerCase() === 'targeturl' && typeof value === 'string') {
+        try {
+          const u = new URL(value);
+          out[key] = `${u.origin}${u.pathname}`;
+        } catch {
+          out[key] = '[REDACTED_URL]';
+        }
+      } else {
+        out[key] = redact(value, depth + 1);
+      }
+    }
+    return out;
+  }
+
+  return String(input);
+}
--- a/src/debug/trace-context.js
+++ b/src/debug/trace-context.js
@ -0,0 +1,39 @@
+/**
+ * @fileoverview AsyncLocalStorage-backed trace context (no logger dependency).
+ * Split from trace.js to avoid circular imports with logger.js.
+ * @module debug/trace-context
+ */
+
+import { AsyncLocalStorage } from 'node:async_hooks';
+import { randomBytes } from 'node:crypto';
+
+/**
+ * @typedef {Object} TraceContext
+ * @property {string} traceId
+ * @property {string} [span]
+ */
+
+/** @type {AsyncLocalStorage<TraceContext>} */
+export const traceStorage = new AsyncLocalStorage();
+
+/**
+ * Generate a short opaque trace id (16 hex chars).
+ * @returns {string}
+ */
+export function generateTraceId() {
+  return randomBytes(8).toString('hex');
+}
+
+/**
+ * @returns {string|null}
+ */
+export function getTraceId() {
+  return traceStorage.getStore()?.traceId ?? null;
+}
+
+/**
+ * @returns {TraceContext|null}
+ */
+export function getTraceContext() {
+  return traceStorage.getStore() ?? null;
+}
--- a/src/debug/trace.js
+++ b/src/debug/trace.js
@ -0,0 +1,95 @@
+/**
+ * @fileoverview Correlation / trace IDs for failure tracing across HTTP and NATS.
+ * @module debug/trace
+ */
+
+import { createDebugger } from './logger.js';
+import {
+  traceStorage,
+  generateTraceId,
+  getTraceId,
+  getTraceContext,
+} from './trace-context.js';
+
+export { generateTraceId, getTraceId, getTraceContext };
+
+const log = createDebugger('trace');
+
+/**
+ * Run `fn` within a trace context. Nested calls inherit the same `traceId`
+ * unless `traceId` is explicitly overridden.
+ *
+ * @template T
+ * @param {object|(() => T|Promise<T>)} options - Options or the callback itself.
+ * @param {string} [options.traceId] - Existing id (e.g. from `X-Trace-Id` header).
+ * @param {string} [options.span] - Human label for this span (logged when debug on).
+ * @param {() => T|Promise<T>} [fn] - Work to execute inside the context when options is an object.
+ * @returns {T|Promise<T>} Return value of `fn`.
+ *
+ * @example
+ * await withTrace({ span: 'timestamp.wait', traceId: req.headers['x-trace-id'] }, async () => {
+ *   // getTraceId() is stable here and in awaited children
+ * });
+ */
+export function withTrace(options, fn) {
+  const opts = typeof options === 'function' ? {} : options ?? {};
+  const callback = typeof options === 'function' ? options : fn;
+
+  if (typeof callback !== 'function') {
+    throw new TypeError('withTrace requires a function to execute');
+  }
+
+  const parent = traceStorage.getStore();
+  const traceId = opts.traceId || parent?.traceId || generateTraceId();
+  const span = opts.span || parent?.span || 'root';
+
+  const ctx = { traceId, span };
+
+  return traceStorage.run(ctx, () => {
+    log.debug('span enter', { span });
+    try {
+      const result = callback();
+      if (result && typeof result.then === 'function') {
+        return result.then(
+          (value) => {
+            log.debug('span exit', { span, ok: true });
+            return value;
+          },
+          (err) => {
+            log.debug('span exit', { span, ok: false, error: err?.message });
+            throw err;
+          },
+        );
+      }
+      log.debug('span exit', { span, ok: true });
+      return result;
+    } catch (err) {
+      log.debug('span exit', { span, ok: false, error: err?.message });
+      throw err;
+    }
+  });
+}
+
+/**
+ * Express middleware that establishes a trace context per request.
+ *
+ * Reads `X-Trace-Id` when present; otherwise generates a new id.
+ * Sets `req.traceId` and response header `X-Trace-Id`.
+ *
+ * @param {import('express').Request} req
+ * @param {import('express').Response} res
+ * @param {import('express').NextFunction} next
+ * @returns {void}
+ */
+export function traceMiddleware(req, res, next) {
+  const incoming = req.headers['x-trace-id'];
+  const traceId =
+    typeof incoming === 'string' && incoming.trim() ? incoming.trim() : generateTraceId();
+
+  req.traceId = traceId;
+  res.setHeader('X-Trace-Id', traceId);
+
+  withTrace({ traceId, span: `${req.method} ${req.path}` }, () => {
+    next();
+  });
+}
--- a/src/errors.js
+++ b/src/errors.js
@ -0,0 +1,75 @@
+/**
+ * @fileoverview Structured errors and Express helpers.
+ * @module errors
+ */
+
+import { createDebugger } from './debug/logger.js';
+import { getTraceId } from './debug/trace-context.js';
+
+const log = createDebugger('app');
+
+/**
+ * Operational error with HTTP status and machine-readable code.
+ */
+export class AppError extends Error {
+  /**
+   * @param {string} message - Human-readable error.
+   * @param {object} [options]
+   * @param {number} [options.status=500] - HTTP status code.
+   * @param {string} [options.code='INTERNAL_ERROR'] - Machine code.
+   * @param {unknown} [options.details] - Optional structured details (safe for clients).
+   */
+  constructor(message, { status = 500, code = 'INTERNAL_ERROR', details } = {}) {
+    super(message);
+    this.name = 'AppError';
+    this.status = status;
+    this.code = code;
+    this.details = details;
+  }
+}
+
+/**
+ * Wrap an async Express handler so rejected promises reach the error middleware.
+ *
+ * @param {(req: import('express').Request, res: import('express').Response, next: import('express').NextFunction) => Promise<unknown>} fn
+ * @returns {import('express').RequestHandler}
+ */
+export function asyncHandler(fn) {
+  return (req, res, next) => {
+    Promise.resolve(fn(req, res, next)).catch(next);
+  };
+}
+
+/**
+ * Send a JSON error response. Logs server errors when debug is enabled.
+ *
+ * @param {import('express').Response} res
+ * @param {Error|AppError} err
+ * @returns {void}
+ */
+export function sendError(res, err) {
+  const status = err instanceof AppError ? err.status : 500;
+  const code = err instanceof AppError ? err.code : 'INTERNAL_ERROR';
+  const message = err?.message || 'Internal server error';
+  const details = err instanceof AppError ? err.details : undefined;
+  const traceId = getTraceId();
+
+  if (status >= 500) {
+    log.error('request failed', {
+      status,
+      code,
+      message,
+      traceId,
+      stack: err?.stack,
+    });
+  } else {
+    log.debug('client error', { status, code, message, traceId });
+  }
+
+  res.status(status).json({
+    error: message,
+    code,
+    ...(details !== undefined ? { details } : {}),
+    ...(traceId ? { traceId } : {}),
+  });
+}
--- a/src/index.js
+++ b/src/index.js
@ -0,0 +1,51 @@
+/**
+ * @fileoverview Process entrypoint: HTTP listen + optional in-process poller.
+ * @module index
+ */
+
+import { createApp } from './app.js';
+import { config } from './config.js';
+import { createDebugger } from './debug/logger.js';
+import { startInProcessJobPoller } from './workers/inProcessJobPoller.js';
+import { connectNats, ensureStreams } from './nats/connection.js';
+import { startJobPollerWorker } from './workers/jobPollerWorker.js';
+import { startWebhookWorker } from './workers/webhookWorker.js';
+
+const log = createDebugger('app');
+
+/**
+ * Start the HTTP server and background workers.
+ * @returns {import('http').Server}
+ */
+export function startServer() {
+  const app = createApp();
+
+  if (config.natsEnabled) {
+    connectNats()
+      .then(({ jsm }) => ensureStreams(jsm))
+      .then(() => Promise.all([startJobPollerWorker(), startWebhookWorker()]))
+      .then(() => log.info('NATS workers started'))
+      .catch((err) => log.error('NATS worker start failed', { error: err.message }));
+  } else {
+    startInProcessJobPoller();
+  }
+
+  const server = app.listen(config.port, config.host, () => {
+    log.info('middleware listening', {
+      host: config.host,
+      port: config.port,
+      veraeApiBaseUrl: config.veraeApiBaseUrl,
+      mockVerae: config.mockVerae,
+      natsEnabled: config.natsEnabled,
+    });
+    // eslint-disable-next-line no-console
+    console.log(
+      `Verae Zapier middleware listening on http://${config.host}:${config.port}`,
+    );
+  });
+  return server;
+}
+
+if (process.argv[1]?.includes('index.js')) {
+  startServer();
+}
--- a/src/lib/receiptPdf.js
+++ b/src/lib/receiptPdf.js
@ -0,0 +1,64 @@
+/**
+ * Minimal PDF builder for retrieval receipts (no native deps).
+ * @module lib/receiptPdf
+ */
+
+/**
+ * @param {string} s
+ * @returns {string}
+ */
+function pdfEscape(s) {
+  return String(s).replace(/\\/g, '\\\\').replace(/\(/g, '\\(').replace(/\)/g, '\\)');
+}
+
+/**
+ * @param {object} receipt
+ * @returns {Buffer}
+ */
+export function buildReceiptPdf(receipt) {
+  const lines = [
+    'Verae Time — certified retrieval receipt',
+    `Type: ${receipt.type}`,
+    `Job ID: ${receipt.jobId}`,
+    `SHA256: ${receipt.sha256 ?? ''}`,
+    `Original timestamp: ${receipt.timestamp ?? ''}`,
+    `Retrieved at: ${receipt.extraSeal?.retrievedAt ?? ''}`,
+    `Tenant: ${receipt.extraSeal?.tenantId ?? ''}`,
+    `Seal event: ${receipt.extraSeal?.event ?? ''}`,
+    `Certificate: ${String(receipt.certificate ?? '').slice(0, 80)}`,
+  ];
+
+  const commands = lines
+    .map((line, i) => {
+      const y = 720 - i * 18;
+      return `BT /F1 11 Tf 50 ${y} Td (${pdfEscape(line)}) Tj ET`;
+    })
+    .join('\n');
+
+  const stream = `${commands}\n`;
+  const objects = [
+    '1 0 obj << /Type /Catalog /Pages 2 0 R >> endobj',
+    '2 0 obj << /Type /Pages /Kids [3 0 R] /Count 1 >> endobj',
+    '3 0 obj << /Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] /Contents 4 0 R /Resources << /Font << /F1 5 0 R >> >> >> endobj',
+    `4 0 obj << /Length ${Buffer.byteLength(stream)} >> stream\n${stream}endstream endobj`,
+    '5 0 obj << /Type /Font /Subtype /Type1 /BaseFont /Helvetica >> endobj',
+  ];
+
+  let offset = '%PDF-1.4\n'.length;
+  const xref = [0];
+  let body = '%PDF-1.4\n';
+  for (const obj of objects) {
+    xref.push(offset);
+    const chunk = `${obj}\n`;
+    body += chunk;
+    offset += Buffer.byteLength(chunk);
+  }
+  const xrefStart = offset;
+  let xrefTable = `xref\n0 ${objects.length + 1}\n0000000000 65535 f \n`;
+  for (let i = 1; i < xref.length; i += 1) {
+    xrefTable += `${String(xref[i]).padStart(10, '0')} 00000 n \n`;
+  }
+  body += xrefTable;
+  body += `trailer << /Size ${objects.length + 1} /Root 1 0 R >>\nstartxref\n${xrefStart}\n%%EOF\n`;
+  return Buffer.from(body, 'utf8');
+}
--- a/src/lib/tokens.js
+++ b/src/lib/tokens.js
@ -0,0 +1,97 @@
+/**
+ * @fileoverview API keys and HMAC session tokens for the middleware auth bridge.
+ * @module lib/tokens
+ */
+
+import { createHmac, randomBytes, timingSafeEqual } from 'node:crypto';
+import { config } from '../config.js';
+
+const TOKEN_PREFIX = 'zmt_';
+const API_KEY_PREFIX = 'zmw_';
+
+/**
+ * @param {string} payload
+ * @returns {string}
+ */
+function sign(payload) {
+  return createHmac('sha256', config.tokenSecret).update(payload).digest('base64url');
+}
+
+/**
+ * Issue a signed middleware session token embedding tenant + Verae JWT.
+ *
+ * @param {object} params
+ * @param {string} params.tenantId
+ * @param {string} params.veraeToken
+ * @param {string} [params.expiresAt]
+ * @returns {string} Token string starting with `zmt_`
+ */
+export function issueSessionToken({ tenantId, veraeToken, expiresAt }) {
+  const payload = Buffer.from(
+    JSON.stringify({
+      tenantId,
+      veraeToken,
+      expiresAt,
+      nonce: randomBytes(8).toString('hex'),
+    }),
+  ).toString('base64url');
+  const signature = sign(payload);
+  return `${TOKEN_PREFIX}${payload}.${signature}`;
+}
+
+/**
+ * Parse and verify a session token.
+ *
+ * @param {string} token
+ * @returns {{ tenantId: string, veraeToken: string, expiresAt?: string, nonce?: string }|null}
+ */
+export function parseSessionToken(token) {
+  if (!token?.startsWith(TOKEN_PREFIX)) return null;
+
+  const raw = token.slice(TOKEN_PREFIX.length);
+  const dot = raw.lastIndexOf('.');
+  if (dot === -1) return null;
+
+  const payload = raw.slice(0, dot);
+  const signature = raw.slice(dot + 1);
+  const expected = sign(payload);
+
+  const sigBuf = Buffer.from(signature);
+  const expBuf = Buffer.from(expected);
+  if (sigBuf.length !== expBuf.length || !timingSafeEqual(sigBuf, expBuf)) {
+    return null;
+  }
+
+  try {
+    return JSON.parse(Buffer.from(payload, 'base64url').toString('utf8'));
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Generate a new public API key (`zmw_…`).
+ * @returns {string}
+ */
+export function generateApiKey() {
+  return `${API_KEY_PREFIX}${randomBytes(24).toString('base64url')}`;
+}
+
+/**
+ * @param {unknown} value
+ * @returns {boolean}
+ */
+export function isApiKey(value) {
+  return typeof value === 'string' && value.startsWith(API_KEY_PREFIX);
+}
+
+/**
+ * Extract bearer credential from an Authorization header.
+ * @param {string|undefined} header
+ * @returns {string|null}
+ */
+export function extractBearerToken(header) {
+  if (!header) return null;
+  const match = String(header).match(/^Bearer\s+(.+)$/i);
+  return match?.[1] ?? null;
+}
--- a/src/middleware/authenticate.js
+++ b/src/middleware/authenticate.js
@ -0,0 +1,27 @@
+/**
+ * @fileoverview Express auth middleware — populates req.auth.
+ * @module middleware/authenticate
+ */
+
+import { extractBearerToken } from '../lib/tokens.js';
+import { resolveAuthContext } from '../services/authService.js';
+import { asyncHandler } from '../errors.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('auth');
+
+/**
+ * Resolve Bearer or x-api-key into `req.auth`.
+ */
+export const authenticate = asyncHandler(async (req, res, next) => {
+  const rawToken =
+    extractBearerToken(req.headers.authorization) ?? req.headers['x-api-key'] ?? null;
+
+  req.auth = await resolveAuthContext(rawToken);
+  log.debug('authenticated', {
+    tenantId: req.auth.tenantId,
+    method: req.auth.authMethod,
+    plan: req.auth.tenant?.plan,
+  });
+  next();
+});
--- a/src/middleware/rateLimit.js
+++ b/src/middleware/rateLimit.js
@ -0,0 +1,56 @@
+/**
+ * @fileoverview Simple in-memory per-tenant rate limiter.
+ * @module middleware/rateLimit
+ */
+
+import { AppError, asyncHandler } from '../errors.js';
+import { getTenant, resolveLimits } from '../store/tenants.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('billing');
+
+/** @type {Map<string, { windowStart: number, count: number }>} */
+const windows = new Map();
+
+/**
+ * Reset rate limit windows (tests).
+ * @returns {void}
+ */
+export function resetRateLimitWindows() {
+  windows.clear();
+}
+
+/**
+ * Enforce plan requestsPerMinute using a 60s sliding fixed window.
+ */
+export const rateLimit = asyncHandler(async (req, res, next) => {
+  const tenantId = req.auth?.tenantId;
+  if (!tenantId) return next();
+
+  const tenant = getTenant(tenantId);
+  const limits = tenant
+    ? resolveLimits(tenant)
+    : { requestsPerMinute: 30 };
+
+  const rpm = limits.requestsPerMinute ?? 30;
+  const now = Date.now();
+  const windowMs = 60_000;
+
+  let entry = windows.get(tenantId);
+  if (!entry || now - entry.windowStart >= windowMs) {
+    entry = { windowStart: now, count: 0 };
+    windows.set(tenantId, entry);
+  }
+
+  entry.count += 1;
+  if (entry.count > rpm) {
+    log.debug('rate limited', { tenantId, count: entry.count, rpm });
+    throw new AppError('Rate limit exceeded', {
+      status: 429,
+      code: 'RATE_LIMITED',
+      details: { requestsPerMinute: rpm },
+    });
+  }
+
+  next();
+});
--- a/src/nats/connection.js
+++ b/src/nats/connection.js
@ -0,0 +1,116 @@
+/**
+ * @fileoverview NATS + JetStream connection lifecycle.
+ * @module nats/connection
+ */
+
+import { createDebugger } from '../debug/logger.js';
+import { config } from '../config.js';
+import { SUBJECTS, STREAMS } from './subjects.js';
+
+const log = createDebugger('nats');
+
+/** @type {import('nats').NatsConnection|null} */
+let nc = null;
+/** @type {import('nats').JetStreamClient|null} */
+let js = null;
+/** @type {import('nats').JetStreamManager|null} */
+let jsm = null;
+
+/**
+ * Connect to NATS and return JetStream handles.
+ *
+ * @param {string} [url=config.natsUrl]
+ * @returns {Promise<{ nc: import('nats').NatsConnection, js: import('nats').JetStreamClient, jsm: import('nats').JetStreamManager }>}
+ */
+export async function connectNats(url = config.natsUrl) {
+  if (!config.natsEnabled && process.env.NATS_FORCE_CONNECT !== '1') {
+    log.debug('connect skipped — NATS_ENABLED=false');
+    throw new Error('NATS is disabled (NATS_ENABLED=false)');
+  }
+
+  if (nc && js && jsm) {
+    return { nc, js, jsm };
+  }
+
+  log.info('connecting to NATS', { url });
+
+  const { connect } = await import('nats');
+  nc = await connect({ servers: url, name: 'verae-zapier-middleware' });
+  js = nc.jetstream();
+  jsm = await nc.jetstreamManager();
+
+  log.info('NATS connected', { url });
+  return { nc, js, jsm };
+}
+
+/** @returns {import('nats').NatsConnection|null} */
+export function getNatsConnection() {
+  return nc;
+}
+
+/**
+ * Idempotently create JetStream streams required by this middleware.
+ *
+ * @param {import('nats').JetStreamManager} [manager]
+ * @returns {Promise<void>}
+ */
+export async function ensureStreams(manager) {
+  const m = manager ?? jsm;
+  if (!m) {
+    throw new Error('JetStream manager not available — call connectNats first');
+  }
+
+  /** @type {Array<{ name: string, subjects: string[] }>} */
+  const defs = [
+    { name: STREAMS.ZAPIER_JOBS, subjects: [SUBJECTS.JOBS_WATCH] },
+    { name: STREAMS.ZAPIER_EVENTS, subjects: [SUBJECTS.JOBS_EVENTS] },
+    { name: STREAMS.ZAPIER_WEBHOOKS, subjects: [SUBJECTS.WEBHOOKS_DELIVER] },
+  ];
+
+  for (const def of defs) {
+    try {
+      await m.streams.info(def.name);
+      log.debug('stream exists', { stream: def.name });
+    } catch {
+      await m.streams.add({
+        name: def.name,
+        subjects: def.subjects,
+        retention: 'limits',
+        storage: 'file',
+        max_age: 24 * 60 * 60 * 1e9, // 24h in ns
+        num_replicas: 1,
+      });
+      log.info('stream created', { stream: def.name, subjects: def.subjects });
+    }
+  }
+}
+
+/**
+ * Close the shared NATS connection if open.
+ * @returns {Promise<void>}
+ */
+export async function closeNats() {
+  if (!nc) {
+    log.debug('closeNats: no active connection');
+    return;
+  }
+  log.info('closing NATS connection');
+  await nc.drain();
+  nc = null;
+  js = null;
+  jsm = null;
+}
+
+/**
+ * @returns {import('nats').JetStreamClient|null}
+ */
+export function getJetStream() {
+  return js;
+}
+
+/**
+ * @returns {boolean}
+ */
+export function isNatsConnected() {
+  return Boolean(nc && !nc.isClosed());
+}
--- a/src/nats/publishers.js
+++ b/src/nats/publishers.js
@ -0,0 +1,95 @@
+/**
+ * @fileoverview JetStream publishers for jobs, events, and webhooks.
+ * @module nats/publishers
+ */
+
+import { createDebugger } from '../debug/logger.js';
+import { getTraceId } from '../debug/trace-context.js';
+import { SUBJECTS } from './subjects.js';
+import { getJetStream, connectNats } from './connection.js';
+
+const log = createDebugger('nats');
+
+/**
+ * @returns {Promise<import('nats').JetStreamClient>}
+ */
+async function requireJs() {
+  let js = getJetStream();
+  if (!js) {
+    const handles = await connectNats();
+    js = handles.js;
+  }
+  return js;
+}
+
+/**
+ * @param {object} partial
+ * @returns {Promise<{ seq: number }>}
+ */
+export async function enqueueWatch(partial) {
+  const msg = {
+    attempt: 0,
+    enqueuedAt: new Date().toISOString(),
+    traceId: getTraceId() || 'no-trace',
+    ...partial,
+  };
+
+  log.debug('enqueueWatch', {
+    subject: SUBJECTS.JOBS_WATCH,
+    tenantId: msg.tenantId,
+    jobId: msg.jobId,
+    attempt: msg.attempt,
+    traceId: msg.traceId,
+  });
+
+  const js = await requireJs();
+  const ack = await js.publish(SUBJECTS.JOBS_WATCH, JSON.stringify(msg));
+  return { seq: Number(ack.seq) };
+}
+
+/**
+ * @param {object} partial
+ * @returns {Promise<{ seq: number }>}
+ */
+export async function publishJobEvent(partial) {
+  const msg = {
+    emittedAt: new Date().toISOString(),
+    traceId: getTraceId() || 'no-trace',
+    ...partial,
+  };
+
+  log.debug('publishJobEvent', {
+    subject: SUBJECTS.JOBS_EVENTS,
+    event: msg.event,
+    jobId: msg.jobId,
+    tenantId: msg.tenantId,
+  });
+
+  const js = await requireJs();
+  const ack = await js.publish(SUBJECTS.JOBS_EVENTS, JSON.stringify(msg));
+  return { seq: Number(ack.seq) };
+}
+
+/**
+ * @param {object} partial
+ * @returns {Promise<{ seq: number }>}
+ */
+export async function enqueueWebhook(partial) {
+  const msg = {
+    attempt: 1,
+    traceId: getTraceId() || 'no-trace',
+    ...partial,
+  };
+
+  log.debug('enqueueWebhook', {
+    subject: SUBJECTS.WEBHOOKS_DELIVER,
+    hookId: msg.hookId,
+    tenantId: msg.tenantId,
+    event: msg.event,
+    targetUrl: msg.targetUrl,
+  });
+
+  const js = await requireJs();
+  const ack = await js.publish(SUBJECTS.WEBHOOKS_DELIVER, JSON.stringify(msg));
+  return { seq: Number(ack.seq) };
+}
--- a/src/nats/subjects.js
+++ b/src/nats/subjects.js
@ -0,0 +1,47 @@
+/**
+ * @fileoverview NATS subject and stream name constants.
+ * @module nats/subjects
+ *
+ * See docs/architecture/nats-subjects.md for payload schemas.
+ */
+
+/**
+ * Subject strings used by publishers and consumers.
+ * @readonly
+ */
+export const SUBJECTS = Object.freeze({
+  /** Work queue: poll Verae job status */
+  JOBS_WATCH: 'verae.zapier.jobs.watch',
+  /** Terminal job outcomes */
+  JOBS_EVENTS: 'verae.zapier.jobs.events',
+  /** Work queue: HTTP POST to Zapier REST Hooks */
+  WEBHOOKS_DELIVER: 'verae.zapier.webhooks.deliver',
+  /** Optional metering stream */
+  USAGE: 'verae.zapier.usage',
+  /** Off-chain WORM / tree-node puts */
+  ARCHIVE_PUT: 'verae.archive.put',
+  /** Broadcast hash lookup to every WORM and tree node (no queue group) */
+  ARCHIVE_QUERY: 'verae.archive.query',
+});
+
+/**
+ * JetStream stream names.
+ * @readonly
+ */
+export const STREAMS = Object.freeze({
+  ZAPIER_JOBS: 'ZAPIER_JOBS',
+  ZAPIER_EVENTS: 'ZAPIER_EVENTS',
+  ZAPIER_WEBHOOKS: 'ZAPIER_WEBHOOKS',
+  ZAPIER_USAGE: 'ZAPIER_USAGE',
+});
+
+/**
+ * Durable consumer names (queue groups).
+ * @readonly
+ */
+export const CONSUMERS = Object.freeze({
+  JOB_POLLER: 'job-poller',
+  EVENT_WEBHOOK_ROUTER: 'event-webhook-router',
+  WEBHOOK_DELIVER: 'webhook-deliver',
+  USAGE_WRITER: 'usage-writer',
+});
--- a/src/nats/wait.js
+++ b/src/nats/wait.js
@ -0,0 +1,59 @@
+/**
+ * Wait for a terminal job event on NATS JOBS_EVENTS.
+ * @module nats/wait
+ */
+
+import { createDebugger } from '../debug/logger.js';
+import { getTraceId } from '../debug/trace-context.js';
+import { SUBJECTS } from './subjects.js';
+import { connectNats, getNatsConnection } from './connection.js';
+
+const log = createDebugger('jobs');
+
+/**
+ * @param {string} jobId
+ * @param {number} timeoutMs
+ * @returns {Promise<object|null>} event payload or null on timeout
+ */
+export async function waitForJobEvent(jobId, timeoutMs) {
+  const handles = getNatsConnection() ? { nc: getNatsConnection() } : await connectNats();
+  const nc = handles.nc;
+  const sub = nc.subscribe(SUBJECTS.JOBS_EVENTS);
+  const traceId = getTraceId();
+  log.debug('waitForJobEvent subscribe', { jobId, timeoutMs, traceId });
+
+  const timeout = new Promise((resolve) => {
+    setTimeout(() => resolve(null), timeoutMs);
+  });
+
+  const firstMatch = (async () => {
+    for await (const msg of sub) {
+      let data;
+      try {
+        data = JSON.parse(typeof msg.string === 'function' ? msg.string() : msg.data);
+      } catch {
+        continue;
+      }
+      if (data.jobId !== jobId) continue;
+      const event = data.event;
+      if (
+        event === 'timestamp.completed' ||
+        event === 'timestamp.failed' ||
+        event === 'timestamp.timeout'
+      ) {
+        return data;
+      }
+    }
+    return null;
+  })();
+
+  try {
+    return await Promise.race([firstMatch, timeout]);
+  } finally {
+    try {
+      sub.unsubscribe();
+    } catch {
+      /* ignore */
+    }
+  }
+}
--- a/src/routes/authRoutes.js
+++ b/src/routes/authRoutes.js
@ -0,0 +1,57 @@
+/**
+ * @fileoverview Auth routes under /zapier/v1/auth
+ * @module routes/authRoutes
+ */
+
+import { Router } from 'express';
+import { asyncHandler, AppError } from '../errors.js';
+import { loginWithCredentials, loginWithApiKey, validateSession } from '../services/authService.js';
+import { getUsageSummary } from '../store/usage.js';
+import { getTenant } from '../store/tenants.js';
+import { extractBearerToken } from '../lib/tokens.js';
+
+export const authRoutes = Router();
+
+authRoutes.post(
+  '/login',
+  asyncHandler(async (req, res) => {
+    const { username, password, api_key: apiKey } = req.body ?? {};
+
+    if (apiKey) {
+      const session = await loginWithApiKey(apiKey);
+      return res.json(session);
+    }
+
+    if (!username || !password) {
+      throw new AppError('username and password are required', {
+        status: 400,
+        code: 'VALIDATION_ERROR',
+      });
+    }
+
+    const session = await loginWithCredentials({ username, password });
+    res.json(session);
+  }),
+);
+
+authRoutes.get(
+  '/me',
+  asyncHandler(async (req, res) => {
+    const rawToken =
+      extractBearerToken(req.headers.authorization) ?? req.headers['x-api-key'] ?? null;
+
+    if (!rawToken) {
+      throw new AppError('Missing authorization token', { status: 401, code: 'UNAUTHORIZED' });
+    }
+
+    const validation = await validateSession(rawToken);
+    const tenant = getTenant(validation.tenantId);
+    const usage = getUsageSummary(validation.tenantId);
+
+    res.json({
+      ...validation,
+      plan: tenant?.plan ?? validation.plan ?? 'free',
+      usage,
+    });
+  }),
+);
--- a/src/routes/hashRoutes.js
+++ b/src/routes/hashRoutes.js
@ -0,0 +1,23 @@
+/**
+ * @module routes/hashRoutes
+ */
+
+import { Router } from 'express';
+import { asyncHandler, AppError } from '../errors.js';
+import { lookupHash } from '../services/timestampService.js';
+
+export const hashRoutes = Router();
+
+hashRoutes.get(
+  '/:sha256',
+  asyncHandler(async (req, res) => {
+    const { sha256 } = req.params;
+    if (!sha256 || !/^[a-fA-F0-9]{64}$/.test(sha256)) {
+      throw new AppError('sha256 must be 64 hex chars', { status: 400, code: 'VALIDATION_ERROR' });
+    }
+    const includeAttached = req.query.includeAttached === 'true' || req.query.includeAttached === '1';
+    const includeTree = req.query.includeTree === 'true' || req.query.includeTree === '1';
+    const result = await lookupHash(req.auth, sha256, { includeAttached, includeTree });
+    res.json(result);
+  }),
+);
--- a/src/routes/index.js
+++ b/src/routes/index.js
@ -0,0 +1,40 @@
+/**
+ * @fileoverview Mount all /zapier routes.
+ * @module routes/index
+ */
+
+import { Router } from 'express';
+import { authRoutes } from './authRoutes.js';
+import { timestampRoutes } from './timestampRoutes.js';
+import { verifyRoutes } from './verifyRoutes.js';
+import { statusRoutes } from './statusRoutes.js';
+import { webhookRoutes } from './webhookRoutes.js';
+import { publicTenantRoutes, adminTenantRoutes } from './tenantRoutes.js';
+import { hashRoutes } from './hashRoutes.js';
+import { receiptRoutes } from './receiptRoutes.js';
+import { objectRoutes, publicShareRoutes } from './objectRoutes.js';
+import { authenticate } from '../middleware/authenticate.js';
+import { rateLimit } from '../middleware/rateLimit.js';
+
+export const apiRoutes = Router();
+
+// Public
+apiRoutes.use('/v1/auth', authRoutes);
+apiRoutes.use('/v1', publicTenantRoutes);
+apiRoutes.use('/v1/admin', adminTenantRoutes);
+apiRoutes.use('/v1/shares', publicShareRoutes);
+
+// Protected
+const protectedRoutes = Router();
+protectedRoutes.use(authenticate);
+protectedRoutes.use(rateLimit);
+
+protectedRoutes.use('/timestamp', timestampRoutes);
+protectedRoutes.use('/verify', verifyRoutes);
+protectedRoutes.use('/status', statusRoutes);
+protectedRoutes.use('/webhooks', webhookRoutes);
+protectedRoutes.use('/hashes', hashRoutes);
+protectedRoutes.use('/receipts', receiptRoutes);
+protectedRoutes.use('/objects', objectRoutes);
+
+apiRoutes.use('/v1', protectedRoutes);
--- a/src/routes/objectRoutes.js
+++ b/src/routes/objectRoutes.js
@ -0,0 +1,125 @@
+/**
+ * Encrypted LTS mock + share grants.
+ * @module routes/objectRoutes
+ */
+
+import { Router } from 'express';
+import { asyncHandler, AppError } from '../errors.js';
+import {
+  putBlob,
+  readBlobPlaintext,
+  createShare,
+  redeemShare,
+  putTree,
+  createTreeShare,
+} from '../store/blobs.js';
+import { createTimestamp } from '../services/timestampService.js';
+
+export const objectRoutes = Router();
+
+objectRoutes.post(
+  '/',
+  asyncHandler(async (req, res) => {
+    const { filename, contentBase64, sha256, publicMetadata, privateMetadata, data } = req.body ?? {};
+    if (!contentBase64 && !data) {
+      throw new AppError('contentBase64 or data is required', { status: 400, code: 'VALIDATION_ERROR' });
+    }
+    const bytes = Buffer.from(String(contentBase64 ?? data), contentBase64 ? 'base64' : 'utf8');
+    const stamp = await createTimestamp(req.auth, {
+      data: data ?? bytes.toString('utf8').slice(0, 1024),
+      sha256,
+      publicMetadata,
+      privateMetadata,
+    });
+    const stored = putBlob({
+      tenantId: req.auth.tenantId,
+      sha256: stamp.sha256 ?? sha256 ?? null,
+      filename,
+      bytes,
+      publicMetadata,
+      privateMetadata,
+    });
+    res.status(201).json({ ...stored, jobId: stamp.jobId, existing: stamp.existing });
+  }),
+);
+
+objectRoutes.get(
+  '/:id',
+  asyncHandler(async (req, res) => {
+    try {
+      const rec = readBlobPlaintext(req.params.id, req.auth.tenantId);
+      if (!rec) throw new AppError('Object not found', { status: 404, code: 'NOT_FOUND' });
+      res.json({
+        id: rec.id,
+        filename: rec.filename,
+        size: rec.size,
+        sha256: rec.sha256,
+        publicMetadata: rec.publicMetadata,
+        privateMetadata: rec.privateMetadata,
+        contentBase64: rec.bytes.toString('base64'),
+      });
+    } catch (err) {
+      if (err.code === 'FORBIDDEN') {
+        throw new AppError('Forbidden', { status: 403, code: 'FORBIDDEN' });
+      }
+      throw err;
+    }
+  }),
+);
+
+objectRoutes.post(
+  '/trees',
+  asyncHandler(async (req, res) => {
+    const { prefix, files } = req.body ?? {};
+    if (!Array.isArray(files) || files.length === 0) {
+      throw new AppError('files array is required', { status: 400, code: 'VALIDATION_ERROR' });
+    }
+    const tree = putTree({
+      tenantId: req.auth.tenantId,
+      prefix: prefix || '/',
+      files: files.map((f) => ({
+        path: String(f.path || f.filename || 'file.bin'),
+        bytes: Buffer.from(String(f.contentBase64 || f.data || ''), f.contentBase64 ? 'base64' : 'utf8'),
+        sha256: f.sha256,
+      })),
+    });
+    res.status(201).json(tree);
+  }),
+);
+
+objectRoutes.post(
+  '/trees/:id/share',
+  asyncHandler(async (req, res) => {
+    const share = createTreeShare({
+      treeId: req.params.id,
+      fromTenantId: req.auth.tenantId,
+      label: req.body?.label,
+    });
+    if (!share) throw new AppError('Tree not found', { status: 404, code: 'NOT_FOUND' });
+    res.status(201).json(share);
+  }),
+);
+
+objectRoutes.post(
+  '/:id/share',
+  asyncHandler(async (req, res) => {
+    const share = createShare({
+      blobId: req.params.id,
+      fromTenantId: req.auth.tenantId,
+      label: req.body?.label,
+    });
+    if (!share) throw new AppError('Object not found', { status: 404, code: 'NOT_FOUND' });
+    res.status(201).json(share);
+  }),
+);
+
+export const publicShareRoutes = Router();
+
+publicShareRoutes.get(
+  '/:token',
+  asyncHandler(async (req, res) => {
+    const payload = redeemShare(req.params.token);
+    if (!payload) throw new AppError('Share not found', { status: 404, code: 'NOT_FOUND' });
+    res.json(payload);
+  }),
+);
--- a/src/routes/receiptRoutes.js
+++ b/src/routes/receiptRoutes.js
@ -0,0 +1,45 @@
+/**
+ * Mock certified retrieval receipt (JSON). Not a payment invoice.
+ * @module routes/receiptRoutes
+ */
+
+import { Router } from 'express';
+import { asyncHandler, AppError } from '../errors.js';
+import { getJobStatus } from '../services/timestampService.js';
+import { buildReceiptPdf } from '../lib/receiptPdf.js';
+
+export const receiptRoutes = Router();
+
+receiptRoutes.get(
+  '/:jobId',
+  asyncHandler(async (req, res) => {
+    const { jobId } = req.params;
+    const format = String(req.query.format || 'json').toLowerCase();
+    const status = await getJobStatus(req.auth, jobId);
+    if (status.status !== 'completed') {
+      throw new AppError('Receipt only for completed jobs', { status: 409, code: 'NOT_COMPLETE' });
+    }
+    const retrievedAt = new Date().toISOString();
+    const receipt = {
+      type: 'verae.retrieval-receipt',
+      format: 'json',
+      jobId,
+      sha256: status.sha256 ?? status.metadata?.sha256,
+      timestamp: status.completedAt ?? status.metadata?.timestamp,
+      certificate: status.result,
+      extraSeal: {
+        event: 'document.retrieved',
+        retrievedAt,
+        tenantId: req.auth.tenantId,
+      },
+    };
+    if (format === 'pdf') {
+      const pdf = buildReceiptPdf({ ...receipt, format: 'pdf' });
+      res.setHeader('content-type', 'application/pdf');
+      res.setHeader('content-disposition', `attachment; filename="verae-receipt-${jobId}.pdf"`);
+      res.send(pdf);
+      return;
+    }
+    res.json(receipt);
+  }),
+);
--- a/src/routes/statusRoutes.js
+++ b/src/routes/statusRoutes.js
@ -0,0 +1,51 @@
+/**
+ * @module routes/statusRoutes
+ */
+
+import { Router } from 'express';
+import { asyncHandler, AppError } from '../errors.js';
+import {
+  getJobStatus,
+  getBatchJobStatus,
+  getJobVerification,
+} from '../services/timestampService.js';
+
+export const statusRoutes = Router();
+
+// Static/more-specific routes first
+statusRoutes.post(
+  '/batch',
+  asyncHandler(async (req, res) => {
+    const { jobIds } = req.body ?? {};
+    if (!Array.isArray(jobIds) || jobIds.length === 0) {
+      throw new AppError('jobIds array is required', { status: 400, code: 'VALIDATION_ERROR' });
+    }
+    const result = await getBatchJobStatus(req.auth, { jobIds });
+    res.json(result);
+  }),
+);
+
+statusRoutes.get(
+  '/:jobId/verification',
+  asyncHandler(async (req, res) => {
+    const result = await getJobVerification(req.auth, req.params.jobId);
+    res.json(result);
+  }),
+);
+
+statusRoutes.get(
+  '/:jobId',
+  asyncHandler(async (req, res) => {
+    const { jobId } = req.params;
+    if (!jobId) {
+      throw new AppError('jobId is required', { status: 400, code: 'VALIDATION_ERROR' });
+    }
+    const result = await getJobStatus(req.auth, jobId);
+    if (req.query.scope === 'public' && result.metadata) {
+      const { publicMetadata, ...restMeta } = result.metadata;
+      result.metadata = { ...restMeta, publicMetadata };
+      delete result.privateMetadata;
+    }
+    res.json(result);
+  }),
+);
--- a/src/routes/tenantRoutes.js
+++ b/src/routes/tenantRoutes.js
@ -0,0 +1,46 @@
+/**
+ * @module routes/tenantRoutes
+ */
+
+import { Router } from 'express';
+import { asyncHandler, AppError } from '../errors.js';
+import {
+  selfServeSignup,
+  provisionTenant,
+  listProvisionedTenants,
+} from '../services/tenantService.js';
+import { config } from '../config.js';
+
+export const publicTenantRoutes = Router();
+export const adminTenantRoutes = Router();
+
+publicTenantRoutes.post(
+  '/signup',
+  asyncHandler(async (req, res) => {
+    const result = await selfServeSignup(req.body ?? {});
+    res.status(201).json(result);
+  }),
+);
+
+adminTenantRoutes.use((req, _res, next) => {
+  const secret = req.headers['x-admin-secret'];
+  if (secret !== config.adminSecret) {
+    return next(new AppError('Invalid admin secret', { status: 403, code: 'FORBIDDEN' }));
+  }
+  next();
+});
+
+adminTenantRoutes.post(
+  '/tenants',
+  asyncHandler(async (req, res) => {
+    const result = await provisionTenant(req.body ?? {});
+    res.status(201).json(result);
+  }),
+);
+
+adminTenantRoutes.get(
+  '/tenants',
+  asyncHandler(async (_req, res) => {
+    res.json({ tenants: listProvisionedTenants() });
+  }),
+);
--- a/src/routes/timestampRoutes.js
+++ b/src/routes/timestampRoutes.js
@ -0,0 +1,61 @@
+/**
+ * @module routes/timestampRoutes
+ */
+
+import { Router } from 'express';
+import { asyncHandler, AppError } from '../errors.js';
+import {
+  createTimestamp,
+  createTimestampAndWait,
+  createBatchTimestamp,
+} from '../services/timestampService.js';
+
+export const timestampRoutes = Router();
+
+timestampRoutes.post(
+  '/',
+  asyncHandler(async (req, res) => {
+    const { data, hashAlg, sha256, publicMetadata, privateMetadata } = req.body ?? {};
+    if (!data && !sha256) {
+      throw new AppError('data or sha256 is required', { status: 400, code: 'VALIDATION_ERROR' });
+    }
+    const result = await createTimestamp(req.auth, {
+      data,
+      hashAlg,
+      sha256,
+      publicMetadata,
+      privateMetadata,
+    });
+    res.status(202).json(result);
+  }),
+);
+
+timestampRoutes.post(
+  '/wait',
+  asyncHandler(async (req, res) => {
+    const { data, hashAlg, sha256, publicMetadata, privateMetadata } = req.body ?? {};
+    if (!data && !sha256) {
+      throw new AppError('data or sha256 is required', { status: 400, code: 'VALIDATION_ERROR' });
+    }
+    const result = await createTimestampAndWait(req.auth, {
+      data,
+      hashAlg,
+      sha256,
+      publicMetadata,
+      privateMetadata,
+    });
+    res.json(result);
+  }),
+);
+
+timestampRoutes.post(
+  '/batch',
+  asyncHandler(async (req, res) => {
+    const { items } = req.body ?? {};
+    if (!Array.isArray(items) || items.length === 0) {
+      throw new AppError('items array is required', { status: 400, code: 'VALIDATION_ERROR' });
+    }
+    const result = await createBatchTimestamp(req.auth, { items });
+    res.status(202).json(result);
+  }),
+);
--- a/src/routes/verifyRoutes.js
+++ b/src/routes/verifyRoutes.js
@ -0,0 +1,36 @@
+/**
+ * @module routes/verifyRoutes
+ */
+
+import { Router } from 'express';
+import { asyncHandler, AppError } from '../errors.js';
+import { verifyTimestamp, verifyBatch } from '../services/verifyService.js';
+
+export const verifyRoutes = Router();
+
+verifyRoutes.post(
+  '/',
+  asyncHandler(async (req, res) => {
+    const { certificate } = req.body ?? {};
+    if (!certificate) {
+      throw new AppError('certificate is required', { status: 400, code: 'VALIDATION_ERROR' });
+    }
+    const result = await verifyTimestamp(req.auth, { certificate });
+    res.json(result);
+  }),
+);
+
+verifyRoutes.post(
+  '/batch',
+  asyncHandler(async (req, res) => {
+    const { certificates } = req.body ?? {};
+    if (!Array.isArray(certificates) || certificates.length === 0) {
+      throw new AppError('certificates array is required', {
+        status: 400,
+        code: 'VALIDATION_ERROR',
+      });
+    }
+    const result = await verifyBatch(req.auth, { certificates });
+    res.json(result);
+  }),
+);
--- a/src/routes/webhookRoutes.js
+++ b/src/routes/webhookRoutes.js
@ -0,0 +1,44 @@
+/**
+ * @module routes/webhookRoutes
+ */
+
+import { Router } from 'express';
+import { asyncHandler, AppError } from '../errors.js';
+import { subscribe, unsubscribe } from '../services/webhookService.js';
+import { listWebhooksForTenant } from '../store/webhooks.js';
+
+export const webhookRoutes = Router();
+
+webhookRoutes.post(
+  '/subscribe',
+  asyncHandler(async (req, res) => {
+    const { targetUrl, event = 'timestamp.completed' } = req.body ?? {};
+    try {
+      const hook = subscribe(req.auth, { targetUrl, event });
+      res.status(201).json(hook);
+    } catch (err) {
+      throw new AppError(err.message, { status: 400, code: 'VALIDATION_ERROR' });
+    }
+  }),
+);
+
+webhookRoutes.delete(
+  '/unsubscribe',
+  asyncHandler(async (req, res) => {
+    const { hookId, targetUrl } = req.body ?? req.query ?? {};
+    try {
+      const result = unsubscribe(req.auth, { hookId, targetUrl });
+      res.json(result);
+    } catch (err) {
+      throw new AppError(err.message, { status: 404, code: 'NOT_FOUND' });
+    }
+  }),
+);
+
+webhookRoutes.get(
+  '/',
+  asyncHandler(async (req, res) => {
+    const hooks = listWebhooksForTenant(req.auth.tenantId);
+    res.json({ webhooks: hooks });
+  }),
+);
--- a/src/services/authService.js
+++ b/src/services/authService.js
@ -0,0 +1,141 @@
+/**
+ * @fileoverview Auth bridge: API keys / sessions → Verae JWT context.
+ * @module services/authService
+ */
+
+import { veraeClient } from '../clients/veraeClient.js';
+import { getTenantByApiKey, getTenant } from '../store/tenants.js';
+import { issueSessionToken, parseSessionToken, isApiKey } from '../lib/tokens.js';
+import { AppError } from '../errors.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('auth');
+
+/**
+ * Login with Verae username/password and issue middleware session token.
+ *
+ * @param {object} params
+ * @param {string} params.username
+ * @param {string} params.password
+ * @param {object} [params.tenant]
+ * @returns {Promise<{ accessToken: string, expiresAt: string, tenant: object, user: object }>}
+ */
+export async function loginWithCredentials({ username, password, tenant }) {
+  log.debug('loginWithCredentials', { username, tenantId: tenant?.id });
+
+  const verae = await veraeClient.login({ username, password });
+
+  if (tenant?.veraeUsername && tenant.veraeUsername !== username) {
+    throw new AppError('Credentials do not match tenant account', {
+      status: 403,
+      code: 'FORBIDDEN',
+    });
+  }
+
+  const tenantId = tenant?.id ?? `user:${verae.user.username}`;
+  const accessToken = issueSessionToken({
+    tenantId,
+    veraeToken: verae.token,
+    expiresAt: verae.expiresAt,
+  });
+
+  return {
+    accessToken,
+    expiresAt: verae.expiresAt,
+    tenant: tenant
+      ? { id: tenant.id, name: tenant.name, plan: tenant.plan }
+      : { id: tenantId, name: verae.user.username, plan: 'free' },
+    user: verae.user,
+  };
+}
+
+/**
+ * Resolve API key to tenant and login with stored Verae credentials.
+ * @param {string} apiKey
+ * @returns {Promise<Awaited<ReturnType<typeof loginWithCredentials>>>}
+ */
+export async function loginWithApiKey(apiKey) {
+  const tenant = getTenantByApiKey(apiKey);
+  if (!tenant) {
+    log.debug('invalid api key');
+    throw new AppError('Invalid API key', { status: 401, code: 'UNAUTHORIZED' });
+  }
+
+  if (!tenant.veraeUsername || !tenant.veraePassword) {
+    throw new AppError('Tenant is missing Verae credentials', {
+      status: 500,
+      code: 'TENANT_MISCONFIGURED',
+    });
+  }
+
+  log.debug('loginWithApiKey', { tenantId: tenant.id, plan: tenant.plan });
+  return loginWithCredentials({
+    username: tenant.veraeUsername,
+    password: tenant.veraePassword,
+    tenant,
+  });
+}
+
+/**
+ * Resolve bearer credential into request auth context.
+ *
+ * @param {string|null} rawToken
+ * @returns {Promise<{ tenantId: string, tenant: object, veraeToken: string, authMethod: string }>}
+ */
+export async function resolveAuthContext(rawToken) {
+  if (!rawToken) {
+    throw new AppError('Missing authorization token', { status: 401, code: 'UNAUTHORIZED' });
+  }
+
+  if (isApiKey(rawToken)) {
+    const session = await loginWithApiKey(rawToken);
+    const parsed = parseSessionToken(session.accessToken);
+    const tenant = getTenant(session.tenant.id) ?? session.tenant;
+    return {
+      tenantId: session.tenant.id,
+      tenant: { id: session.tenant.id, name: session.tenant.name, plan: session.tenant.plan },
+      veraeToken: parsed.veraeToken,
+      authMethod: 'api_key',
+      fullTenant: tenant,
+    };
+  }
+
+  const parsed = parseSessionToken(rawToken);
+  if (!parsed?.veraeToken) {
+    throw new AppError('Invalid or expired session token', { status: 401, code: 'UNAUTHORIZED' });
+  }
+
+  if (parsed.expiresAt && Date.parse(parsed.expiresAt) < Date.now()) {
+    throw new AppError('Session token expired', { status: 401, code: 'TOKEN_EXPIRED' });
+  }
+
+  const tenant = getTenant(parsed.tenantId);
+  log.debug('session auth', { tenantId: parsed.tenantId });
+  return {
+    tenantId: parsed.tenantId,
+    tenant: tenant
+      ? { id: tenant.id, name: tenant.name, plan: tenant.plan }
+      : { id: parsed.tenantId, plan: 'free' },
+    veraeToken: parsed.veraeToken,
+    authMethod: 'session',
+    fullTenant: tenant,
+  };
+}
+
+/**
+ * Validate auth and optionally ping Verae /auth/validate.
+ * @param {string} rawToken
+ * @returns {Promise<object>}
+ */
+export async function validateSession(rawToken) {
+  const context = await resolveAuthContext(rawToken);
+  const validation = await veraeClient.validate(context.veraeToken);
+
+  return {
+    valid: true,
+    tenantId: context.tenantId,
+    plan: context.tenant.plan,
+    authMethod: context.authMethod,
+    user: validation,
+  };
+}
--- a/src/services/entitlementService.js
+++ b/src/services/entitlementService.js
@ -0,0 +1,160 @@
+/**
+ * @fileoverview Plan quotas and usage recording.
+ * @module services/entitlementService
+ */
+
+import { config } from '../config.js';
+import { AppError } from '../errors.js';
+import { getTenant, resolveLimits } from '../store/tenants.js';
+import { getUsage, incrementUsage } from '../store/usage.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('billing');
+
+function isUnlimited(value) {
+  return value === null || value === undefined;
+}
+
+function quotaExceeded({ limit, used, allowOverage }) {
+  if (isUnlimited(limit)) return false;
+  if (used < limit) return false;
+  return !allowOverage;
+}
+
+/**
+ * Ensure tenant may perform an action under plan limits.
+ *
+ * @param {string} tenantId
+ * @param {'timestamp'|'verify'|'batch_timestamp'} action
+ * @param {{ amount?: number }} [options]
+ * @returns {{ tenant: object, limits: object, usage: object }}
+ */
+export function checkEntitlement(tenantId, action, { amount = 1 } = {}) {
+  const tenant = getTenant(tenantId);
+  if (!tenant) {
+    throw new AppError('Unknown tenant', { status: 401, code: 'UNAUTHORIZED' });
+  }
+
+  const limits = resolveLimits(tenant);
+  const usage = getUsage(tenantId);
+
+  log.debug('checkEntitlement', {
+    tenantId,
+    action,
+    plan: tenant.plan,
+    amount,
+    timestampsUsed: usage.timestamps,
+    timestampsLimit: limits.timestamps,
+  });
+
+  if (action === 'batch_timestamp') {
+    if (!limits.batch) {
+      throw new AppError('Batch timestamps require a paid plan', {
+        status: 403,
+        code: 'PLAN_UPGRADE_REQUIRED',
+        details: { upgradeUrl: config.upgradeUrl },
+      });
+    }
+    if (!isUnlimited(limits.batchMaxItems) && amount > limits.batchMaxItems) {
+      throw new AppError(`Batch size exceeds plan limit of ${limits.batchMaxItems}`, {
+        status: 403,
+        code: 'BATCH_LIMIT_EXCEEDED',
+        details: { upgradeUrl: config.upgradeUrl, limit: limits.batchMaxItems },
+      });
+    }
+  }
+
+  if (action === 'timestamp') {
+    if (
+      quotaExceeded({
+        limit: limits.timestamps,
+        used: usage.timestamps,
+        allowOverage: limits.allowOverage,
+      })
+    ) {
+      const err = new AppError('Monthly timestamp quota exceeded', {
+        status: 402,
+        code: 'QUOTA_EXCEEDED',
+        details: {
+          limit: limits.timestamps,
+          used: usage.timestamps,
+          period: 'monthly',
+          upgradeUrl: config.upgradeUrl,
+        },
+      });
+      throw err;
+    }
+  }
+
+  if (action === 'verify') {
+    if (
+      quotaExceeded({
+        limit: limits.verifications,
+        used: usage.verifications,
+        allowOverage: limits.allowOverage,
+      })
+    ) {
+      throw new AppError('Monthly verification quota exceeded', {
+        status: 402,
+        code: 'QUOTA_EXCEEDED',
+        details: {
+          limit: limits.verifications,
+          used: usage.verifications,
+          period: 'monthly',
+          upgradeUrl: config.upgradeUrl,
+        },
+      });
+    }
+  }
+
+  return { tenant, limits, usage };
+}
+
+/**
+ * Record usage after a successful action.
+ *
+ * @param {string} tenantId
+ * @param {string} action
+ * @param {{ amount?: number }} [options]
+ * @returns {void}
+ */
+export function recordUsage(tenantId, action, { amount = 1 } = {}) {
+  const tenant = getTenant(tenantId);
+  if (!tenant) return;
+
+  const limits = resolveLimits(tenant);
+  const usage = getUsage(tenantId);
+
+  if (action === 'timestamp') {
+    if (
+      !isUnlimited(limits.timestamps) &&
+      usage.timestamps >= limits.timestamps &&
+      limits.allowOverage
+    ) {
+      incrementUsage(tenantId, 'overage.timestamps', amount);
+    }
+    incrementUsage(tenantId, 'timestamps', amount);
+  }
+
+  if (action === 'verify') {
+    if (
+      !isUnlimited(limits.verifications) &&
+      usage.verifications >= limits.verifications &&
+      limits.allowOverage
+    ) {
+      incrementUsage(tenantId, 'overage.verifications', amount);
+    }
+    incrementUsage(tenantId, 'verifications', amount);
+  }
+
+  if (action === 'status') {
+    incrementUsage(tenantId, 'statusChecks', amount);
+  }
+
+  if (action === 'batch_timestamp') {
+    incrementUsage(tenantId, 'batchTimestamps', amount);
+    incrementUsage(tenantId, 'timestamps', amount);
+  }
+
+  log.debug('recordUsage', { tenantId, action, amount });
+}
--- a/src/services/tenantService.js
+++ b/src/services/tenantService.js
@ -0,0 +1,137 @@
+/**
+ * @fileoverview Self-serve signup and admin tenant provisioning.
+ * @module services/tenantService
+ */
+
+import { randomUUID } from 'node:crypto';
+import { createTenant, getTenant, listTenants } from '../store/tenants.js';
+import { veraeClient } from '../clients/veraeClient.js';
+import { AppError } from '../errors.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('auth');
+const ALLOWED_PLANS = new Set(['free', 'starter', 'pro', 'enterprise']);
+
+function slugify(value) {
+  return value
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, '-')
+    .replace(/^-|-$/g, '')
+    .slice(0, 48);
+}
+
+async function validateVeraeCredentials(username, password) {
+  try {
+    await veraeClient.login({ username, password });
+    return true;
+  } catch (err) {
+    throw new AppError('Invalid Verae credentials', {
+      status: 400,
+      code: 'INVALID_VERAE_CREDENTIALS',
+      details: { message: err.message },
+    });
+  }
+}
+
+/**
+ * Public free-tier signup.
+ * @param {{ email: string, name: string, veraeUsername: string, veraePassword: string }} params
+ */
+export async function selfServeSignup({ email, name, veraeUsername, veraePassword }) {
+  if (!email || !name || !veraeUsername || !veraePassword) {
+    throw new AppError('email, name, veraeUsername, and veraePassword are required', {
+      status: 400,
+      code: 'VALIDATION_ERROR',
+    });
+  }
+
+  await validateVeraeCredentials(veraeUsername, veraePassword);
+
+  const id = `tenant-${slugify(email)}-${randomUUID().slice(0, 8)}`;
+  const { tenant, apiKey } = createTenant({
+    id,
+    name,
+    plan: 'free',
+    veraeUsername,
+    veraePassword,
+    contract: null,
+    metadata: { email, audience: 'self-serve', createdVia: 'signup' },
+  });
+
+  log.info('self-serve signup', { tenantId: tenant.id });
+
+  return {
+    tenant: { id: tenant.id, name: tenant.name, plan: tenant.plan, email },
+    apiKey,
+    zapierSetup: {
+      authType: 'custom',
+      field: 'api_key',
+      middlewareUrl: '/zapier/v1/auth/me',
+    },
+  };
+}
+
+/**
+ * Admin provision (internal / enterprise).
+ */
+export async function provisionTenant({
+  id,
+  name,
+  plan,
+  veraeUsername,
+  veraePassword,
+  contract = null,
+  metadata = {},
+  audience = 'admin',
+}) {
+  if (!name || !plan || !veraeUsername || !veraePassword) {
+    throw new AppError('name, plan, veraeUsername, and veraePassword are required', {
+      status: 400,
+      code: 'VALIDATION_ERROR',
+    });
+  }
+
+  if (!ALLOWED_PLANS.has(plan)) {
+    throw new AppError(`Invalid plan: ${plan}`, { status: 400, code: 'VALIDATION_ERROR' });
+  }
+
+  if (plan === 'enterprise' && !contract) {
+    throw new AppError('enterprise tenants require a contract object', {
+      status: 400,
+      code: 'VALIDATION_ERROR',
+    });
+  }
+
+  await validateVeraeCredentials(veraeUsername, veraePassword);
+
+  const tenantId = id ?? `tenant-${slugify(name)}-${randomUUID().slice(0, 8)}`;
+  if (getTenant(tenantId)) {
+    throw new AppError('Tenant already exists', { status: 409, code: 'CONFLICT' });
+  }
+
+  const { tenant, apiKey } = createTenant({
+    id: tenantId,
+    name,
+    plan,
+    veraeUsername,
+    veraePassword,
+    contract,
+    metadata: { ...metadata, audience, createdVia: 'provision' },
+  });
+
+  log.info('tenant provisioned', { tenantId: tenant.id, plan, audience });
+  return { tenant: { id: tenant.id, name: tenant.name, plan: tenant.plan }, apiKey };
+}
+
+/**
+ * @returns {Array<object>}
+ */
+export function listProvisionedTenants() {
+  return listTenants().map((tenant) => ({
+    id: tenant.id,
+    name: tenant.name,
+    plan: tenant.plan,
+    audience: tenant.metadata?.audience ?? 'unknown',
+    createdAt: tenant.createdAt,
+  }));
+}
--- a/src/services/timestampService.js
+++ b/src/services/timestampService.js
@ -0,0 +1,169 @@
+/**
+ * @fileoverview Timestamp create/status operations with billing + job enqueue.
+ * @module services/timestampService
+ */
+
+import { config } from '../config.js';
+import { veraeClient } from '../clients/veraeClient.js';
+import { enqueueJob } from '../store/jobWatchers.js';
+import { checkEntitlement, recordUsage } from './entitlementService.js';
+import { createDebugger } from '../debug/logger.js';
+import { getTraceId } from '../debug/trace-context.js';
+
+const log = createDebugger('jobs');
+
+/**
+ * Enqueue async job watch via NATS or in-process store.
+ * @param {object} ctx
+ * @param {string} jobId
+ */
+async function enqueueWatchForJob(ctx, jobId) {
+  const traceId = getTraceId() ?? undefined;
+
+  if (config.natsEnabled) {
+    const { enqueueWatch } = await import('../nats/publishers.js');
+    await enqueueWatch({
+      tenantId: ctx.tenantId,
+      jobId,
+      // Prefer re-login in worker; include token for MVP simplicity when mock
+      veraeToken: ctx.veraeToken,
+      maxAttempts: config.jobPollMaxAttempts,
+      intervalMs: config.jobPollIntervalMs,
+      traceId,
+    });
+    log.debug('watch enqueued on NATS', { jobId, tenantId: ctx.tenantId });
+    return;
+  }
+
+  enqueueJob({
+    tenantId: ctx.tenantId,
+    jobId,
+    veraeToken: ctx.veraeToken,
+    traceId,
+  });
+}
+
+/**
+ * @param {object} ctx - Auth context with tenantId, veraeToken
+ * @param {{ data?: string, hashAlg?: string, sha256?: string, publicMetadata?: object, privateMetadata?: object }} body
+ * @returns {Promise<{ jobId: string, sha256?: string, existing?: boolean }>}
+ */
+export async function createTimestamp(ctx, body) {
+  checkEntitlement(ctx.tenantId, 'timestamp');
+  const result = await veraeClient.createTimestamp(ctx.veraeToken, body);
+  recordUsage(ctx.tenantId, 'timestamp');
+
+  await enqueueWatchForJob(ctx, result.jobId);
+
+  log.debug('timestamp created', { jobId: result.jobId, tenantId: ctx.tenantId });
+  return result;
+}
+
+/**
+ * @param {object} ctx
+ * @param {{ data: string, hashAlg?: string }} body
+ * @returns {Promise<object>} StatusResponse
+ */
+export async function createTimestampAndWait(ctx, body) {
+  const created = await createTimestamp(ctx, body);
+
+  if (config.natsEnabled) {
+    const { waitForJobEvent } = await import('../nats/wait.js');
+    const event = await waitForJobEvent(created.jobId, config.waitTimeoutMs);
+    if (event?.status) {
+      recordUsage(ctx.tenantId, 'status');
+      log.debug('wait via NATS event', {
+        jobId: created.jobId,
+        event: event.event,
+        traceId: event.traceId,
+      });
+      return event.status;
+    }
+    const status = await veraeClient.getStatus(ctx.veraeToken, created.jobId);
+    recordUsage(ctx.tenantId, 'status');
+    if (status.status === 'pending') {
+      return { id: created.jobId, jobId: created.jobId, status: 'pending' };
+    }
+    return status;
+  }
+
+  try {
+    const status = await veraeClient.waitForJob(ctx.veraeToken, created.jobId, {
+      maxAttempts: config.jobPollMaxAttempts,
+      intervalMs: config.jobPollIntervalMs,
+    });
+    recordUsage(ctx.tenantId, 'status');
+    return status;
+  } catch {
+    const status = await veraeClient.getStatus(ctx.veraeToken, created.jobId);
+    recordUsage(ctx.tenantId, 'status');
+    return { id: created.jobId, jobId: created.jobId, status: status.status ?? 'pending' };
+  }
+}
+
+/**
+ * @param {object} ctx
+ * @param {{ items: Array<{ data: string, hashAlg?: string }> }} body
+ */
+export async function createBatchTimestamp(ctx, body) {
+  const itemCount = body.items?.length ?? 0;
+  checkEntitlement(ctx.tenantId, 'batch_timestamp', { amount: itemCount });
+  const result = await veraeClient.createBatchTimestamp(ctx.veraeToken, body);
+  recordUsage(ctx.tenantId, 'batch_timestamp', { amount: itemCount });
+
+  for (const jobId of result.jobIds ?? []) {
+    await enqueueWatchForJob(ctx, jobId);
+  }
+
+  return result;
+}
+
+/**
+ * @param {object} ctx
+ * @param {string} jobId
+ */
+export async function getJobStatus(ctx, jobId) {
+  const status = await veraeClient.getStatus(ctx.veraeToken, jobId);
+  recordUsage(ctx.tenantId, 'status');
+  return status;
+}
+
+/**
+ * @param {object} ctx
+ * @param {{ jobIds: string[] }} body
+ */
+export async function getBatchJobStatus(ctx, body) {
+  const status = await veraeClient.getBatchStatus(ctx.veraeToken, body);
+  recordUsage(ctx.tenantId, 'status', { amount: body.jobIds?.length ?? 1 });
+  return status;
+}
+
+/**
+ * @param {object} ctx
+ * @param {string} jobId
+ */
+export async function getJobVerification(ctx, jobId) {
+  const status = await veraeClient.getJobVerification(ctx.veraeToken, jobId);
+  recordUsage(ctx.tenantId, 'status');
+  return status;
+}
+
+/**
+ * @param {object} ctx
+ * @param {string} sha256
+ * @param {{ includeAttached?: boolean, includeTree?: boolean }} [opts]
+ */
+export async function lookupHash(ctx, sha256, opts = {}) {
+  const result = await veraeClient.lookupHash(ctx.veraeToken, sha256);
+  recordUsage(ctx.tenantId, 'status');
+  if (!opts.includeAttached && !opts.includeTree) return result;
+  return {
+    ...result,
+    includeAttached: Boolean(opts.includeAttached),
+    includeTree: Boolean(opts.includeTree),
+    note:
+      opts.includeTree && !result?.exists
+        ? 'Chain miss: middleware should broadcast verae.archive.query kinds=["tree"] (wired in simulator; live aggregator hook TBD).'
+        : undefined,
+  };
+}
--- a/src/services/verifyService.js
+++ b/src/services/verifyService.js
@ -0,0 +1,34 @@
+/**
+ * @fileoverview Certificate verification with usage metering.
+ * @module services/verifyService
+ */
+
+import { veraeClient } from '../clients/veraeClient.js';
+import { checkEntitlement, recordUsage } from './entitlementService.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('jobs');
+
+/**
+ * @param {object} ctx
+ * @param {{ certificate: string }} body
+ */
+export async function verifyTimestamp(ctx, body) {
+  checkEntitlement(ctx.tenantId, 'verify');
+  const result = await veraeClient.verify(ctx.veraeToken, body);
+  recordUsage(ctx.tenantId, 'verify');
+  log.debug('verify result', { tenantId: ctx.tenantId, valid: result.valid });
+  return result;
+}
+
+/**
+ * @param {object} ctx
+ * @param {{ certificates: string[] }} body
+ */
+export async function verifyBatch(ctx, body) {
+  const amount = body.certificates?.length ?? 1;
+  checkEntitlement(ctx.tenantId, 'verify', { amount });
+  const result = await veraeClient.verifyBatch(ctx.veraeToken, body);
+  recordUsage(ctx.tenantId, 'verify', { amount });
+  return result;
+}
--- a/src/services/webhookService.js
+++ b/src/services/webhookService.js
@ -0,0 +1,70 @@
+/**
+ * @fileoverview REST Hook subscribe/unsubscribe and HTTP delivery.
+ * @module services/webhookService
+ */
+
+import { createWebhook, deleteWebhook } from '../store/webhooks.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('webhooks');
+
+const ALLOWED_EVENTS = new Set(['timestamp.completed', 'timestamp.failed']);
+
+/**
+ * @param {object} ctx - auth context
+ * @param {{ targetUrl: string, event: string }} params
+ */
+export function subscribe(ctx, { targetUrl, event }) {
+  if (!targetUrl) {
+    throw new Error('targetUrl is required');
+  }
+  if (!ALLOWED_EVENTS.has(event)) {
+    throw new Error(`Unsupported event: ${event}`);
+  }
+
+  return createWebhook({
+    tenantId: ctx.tenantId,
+    targetUrl,
+    event,
+  });
+}
+
+/**
+ * @param {object} ctx
+ * @param {{ hookId?: string, targetUrl?: string }} params
+ */
+export function unsubscribe(ctx, { hookId, targetUrl }) {
+  const removed = deleteWebhook({
+    tenantId: ctx.tenantId,
+    hookId,
+    targetUrl,
+  });
+
+  if (!removed) {
+    throw new Error('Webhook subscription not found');
+  }
+
+  return { removed: true };
+}
+
+/**
+ * POST payload to Zapier target URL.
+ * @param {string} targetUrl
+ * @param {object} payload
+ * @returns {Promise<{ ok: boolean, status: number }>}
+ */
+export async function deliverWebhook(targetUrl, payload) {
+  log.debug('deliverWebhook', { targetUrl, event: payload?.event });
+
+  const response = await fetch(targetUrl, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+      'User-Agent': 'Verae-Zapier-Middleware/1.0',
+    },
+    body: JSON.stringify(payload),
+  });
+
+  log.debug('deliverWebhook result', { status: response.status, ok: response.ok });
+  return { ok: response.ok, status: response.status };
+}
--- a/src/store/blobs.js
+++ b/src/store/blobs.js
@ -0,0 +1,208 @@
+/**
+ * Mock encrypted long-term object store + share grants.
+ * @module store/blobs
+ */
+
+import { createCipheriv, createDecipheriv, randomBytes, randomUUID } from 'node:crypto';
+import { getStore, persist } from './db.js';
+
+const ALGO = 'aes-256-gcm';
+
+function ensure() {
+  const store = getStore();
+  store.blobs ??= {};
+  store.shares ??= {};
+  store.trees ??= {};
+  return store;
+}
+
+/**
+ * @param {Buffer} plaintext
+ * @param {Buffer} key 32 bytes
+ */
+function encrypt(plaintext, key) {
+  const iv = randomBytes(12);
+  const cipher = createCipheriv(ALGO, key, iv);
+  const ciphertext = Buffer.concat([cipher.update(plaintext), cipher.final()]);
+  const tag = cipher.getAuthTag();
+  return { iv: iv.toString('base64'), tag: tag.toString('base64'), ciphertext: ciphertext.toString('base64') };
+}
+
+/**
+ * @param {{ iv: string, tag: string, ciphertext: string }} enc
+ * @param {Buffer} key
+ */
+export function decryptBlob(enc, key) {
+  const decipher = createDecipheriv(ALGO, key, Buffer.from(enc.iv, 'base64'));
+  decipher.setAuthTag(Buffer.from(enc.tag, 'base64'));
+  return Buffer.concat([
+    decipher.update(Buffer.from(enc.ciphertext, 'base64')),
+    decipher.final(),
+  ]);
+}
+
+/**
+ * @param {object} params
+ * @param {string} params.tenantId
+ * @param {string} [params.sha256]
+ * @param {string} [params.filename]
+ * @param {Buffer} params.bytes
+ * @param {object} [params.publicMetadata]
+ * @param {object} [params.privateMetadata]
+ */
+export function putBlob({ tenantId, sha256, filename, bytes, publicMetadata = {}, privateMetadata = {} }) {
+  const store = ensure();
+  const id = randomUUID();
+  const key = randomBytes(32);
+  const enc = encrypt(bytes, key);
+  store.blobs[id] = {
+    id,
+    tenantId,
+    sha256: sha256 ?? null,
+    filename: filename ?? 'object.bin',
+    size: bytes.length,
+    enc,
+    dek: key.toString('base64'),
+    publicMetadata,
+    privateMetadata,
+    createdAt: new Date().toISOString(),
+  };
+  persist();
+  return { id, sha256: store.blobs[id].sha256, size: bytes.length, filename: store.blobs[id].filename };
+}
+
+export function getBlobRecord(id) {
+  return ensure().blobs[id] ?? null;
+}
+
+/**
+ * Decrypt for owner tenant only.
+ * @param {string} id
+ * @param {string} tenantId
+ */
+export function readBlobPlaintext(id, tenantId) {
+  const rec = getBlobRecord(id);
+  if (!rec) return null;
+  if (rec.tenantId !== tenantId) {
+    const err = new Error('Forbidden');
+    err.code = 'FORBIDDEN';
+    throw err;
+  }
+  return {
+    ...rec,
+    bytes: decryptBlob(rec.enc, Buffer.from(rec.dek, 'base64')),
+  };
+}
+
+/**
+ * @param {{ blobId: string, fromTenantId: string, label?: string }} params
+ */
+export function createShare({ blobId, fromTenantId, label }) {
+  const rec = getBlobRecord(blobId);
+  if (!rec || rec.tenantId !== fromTenantId) return null;
+  const token = `shr_${randomBytes(16).toString('hex')}`;
+  const store = ensure();
+  store.shares[token] = {
+    token,
+    kind: 'file',
+    blobId,
+    fromTenantId,
+    label: label ?? rec.filename,
+    createdAt: new Date().toISOString(),
+  };
+  persist();
+  return { token, blobId, label: store.shares[token].label };
+}
+
+/**
+ * Redeem a share token: ciphertext + wrapped key for the recipient.
+ * @param {string} token
+ */
+export function redeemShare(token) {
+  const store = ensure();
+  const share = store.shares[token];
+  if (!share) return null;
+  if (share.kind === 'tree') {
+    const tree = store.trees[share.treeId];
+    if (!tree) return null;
+    return {
+      token,
+      kind: 'tree',
+      prefix: tree.prefix,
+      files: tree.entries.map((e) => {
+        const rec = store.blobs[e.blobId];
+        return rec
+          ? {
+              path: e.path,
+              blobId: rec.id,
+              filename: rec.filename,
+              size: rec.size,
+              sha256: rec.sha256,
+              enc: rec.enc,
+              dek: rec.dek,
+            }
+          : { path: e.path, missing: true };
+      }),
+      note: 'Mock tree share: each file includes dek. Production must wrap per-file deks to recipient pubkey.',
+    };
+  }
+  const rec = store.blobs[share.blobId];
+  if (!rec) return null;
+  return {
+    token,
+    kind: 'file',
+    blobId: rec.id,
+    filename: rec.filename,
+    size: rec.size,
+    sha256: rec.sha256,
+    publicMetadata: rec.publicMetadata ?? {},
+    enc: rec.enc,
+    dek: rec.dek,
+    note: 'Mock share: dek is included so the recipient can decrypt. Production must wrap dek to recipient pubkey.',
+  };
+}
+
+/**
+ * @param {{ tenantId: string, prefix: string, files: Array<{ path: string, bytes: Buffer, sha256?: string }> }} params
+ */
+export function putTree({ tenantId, prefix, files }) {
+  const store = ensure();
+  const id = randomUUID();
+  const entries = [];
+  for (const file of files) {
+    const stored = putBlob({
+      tenantId,
+      sha256: file.sha256,
+      filename: file.path.split('/').pop(),
+      bytes: file.bytes,
+    });
+    entries.push({ path: file.path, blobId: stored.id });
+  }
+  store.trees[id] = { id, tenantId, prefix: prefix || '/', entries, createdAt: new Date().toISOString() };
+  persist();
+  return { id, prefix: store.trees[id].prefix, fileCount: entries.length };
+}
+
+export function getTree(id) {
+  return ensure().trees[id] ?? null;
+}
+
+/**
+ * @param {{ treeId: string, fromTenantId: string, label?: string }} params
+ */
+export function createTreeShare({ treeId, fromTenantId, label }) {
+  const tree = getTree(treeId);
+  if (!tree || tree.tenantId !== fromTenantId) return null;
+  const token = `shr_${randomBytes(16).toString('hex')}`;
+  const store = ensure();
+  store.shares[token] = {
+    token,
+    kind: 'tree',
+    treeId,
+    fromTenantId,
+    label: label ?? tree.prefix,
+    createdAt: new Date().toISOString(),
+  };
+  persist();
+  return { token, kind: 'tree', treeId, label: store.shares[token].label, fileCount: tree.entries.length };
+}
--- a/src/store/db.js
+++ b/src/store/db.js
@ -0,0 +1,117 @@
+/**
+ * @fileoverview JSON file-backed in-memory store (MVP persistence).
+ * @module store/db
+ */
+
+import { readFileSync, writeFileSync, mkdirSync, existsSync } from 'node:fs';
+import { dirname } from 'node:path';
+import { config } from '../config.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('app');
+
+/**
+ * @typedef {Object} StoreShape
+ * @property {Record<string, object>} tenants
+ * @property {Record<string, string>} apiKeys - apiKey → tenantId
+ * @property {Record<string, object>} usage - tenantId → counters
+ * @property {object[]} webhooks
+ * @property {object[]} jobWatchers
+ */
+
+/** @type {StoreShape|null} */
+let store = null;
+
+/**
+ * Create an empty store document.
+ * @returns {StoreShape}
+ */
+export function emptyStore() {
+  return {
+    tenants: {},
+    apiKeys: {},
+    usage: {},
+    webhooks: [],
+    jobWatchers: [],
+    blobs: {},
+    shares: {},
+    trees: {},
+  };
+}
+
+/**
+ * Load store from disk into memory (or create empty if missing).
+ * @param {string} [path=config.storePath]
+ * @returns {StoreShape}
+ */
+export function loadStore(path = config.storePath) {
+  if (store) return store;
+
+  if (existsSync(path)) {
+    try {
+      const raw = readFileSync(path, 'utf8');
+      const parsed = JSON.parse(raw);
+      store = {
+        ...emptyStore(),
+        ...parsed,
+        tenants: parsed.tenants ?? {},
+        apiKeys: parsed.apiKeys ?? {},
+        usage: parsed.usage ?? {},
+        webhooks: Array.isArray(parsed.webhooks) ? parsed.webhooks : [],
+        jobWatchers: Array.isArray(parsed.jobWatchers) ? parsed.jobWatchers : [],
+      };
+      log.debug('store loaded', { path, tenants: Object.keys(store.tenants).length });
+    } catch (err) {
+      log.error('store load failed, using empty', { path, error: err.message });
+      store = emptyStore();
+    }
+  } else {
+    store = emptyStore();
+    log.debug('store initialized empty', { path });
+  }
+
+  return store;
+}
+
+/**
+ * Access the in-memory store (loads if needed).
+ * @returns {StoreShape}
+ */
+export function getStore() {
+  if (!store) return loadStore();
+  return store;
+}
+
+/**
+ * Replace the in-memory store (tests only).
+ * @param {StoreShape|null} next
+ * @returns {void}
+ */
+export function setStoreForTests(next) {
+  store = next;
+}
+
+/**
+ * Persist the in-memory store to disk.
+ * @param {string} [path=config.storePath]
+ * @returns {void}
+ */
+export function persist(path = config.storePath) {
+  const data = getStore();
+  const dir = dirname(path);
+  if (!existsSync(dir)) {
+    mkdirSync(dir, { recursive: true });
+  }
+  writeFileSync(path, JSON.stringify(data, null, 2), 'utf8');
+  log.debug('store persisted', { path });
+}
+
+/**
+ * Force reload from disk (drops memory).
+ * @param {string} [path=config.storePath]
+ * @returns {StoreShape}
+ */
+export function reloadStore(path = config.storePath) {
+  store = null;
+  return loadStore(path);
+}
--- a/src/store/jobWatchers.js
+++ b/src/store/jobWatchers.js
@ -0,0 +1,89 @@
+/**
+ * @fileoverview In-process job watch queue (NATS_ENABLED=false path).
+ * @module store/jobWatchers
+ */
+
+import { randomUUID } from 'node:crypto';
+import { getStore, persist } from './db.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('jobs');
+
+/**
+ * @typedef {Object} JobWatcher
+ * @property {string} id
+ * @property {string} tenantId
+ * @property {string} jobId
+ * @property {string} veraeToken
+ * @property {string} status
+ * @property {number} attempts
+ * @property {string} createdAt
+ * @property {string} updatedAt
+ * @property {string} [traceId]
+ */
+
+/**
+ * @param {object} params
+ * @param {string} params.tenantId
+ * @param {string} params.jobId
+ * @param {string} params.veraeToken
+ * @param {string} [params.traceId]
+ * @returns {JobWatcher}
+ */
+export function enqueueJob({ tenantId, jobId, veraeToken, traceId }) {
+  /** @type {JobWatcher} */
+  const watcher = {
+    id: randomUUID(),
+    tenantId,
+    jobId,
+    veraeToken,
+    status: 'pending',
+    attempts: 0,
+    createdAt: new Date().toISOString(),
+    updatedAt: new Date().toISOString(),
+    traceId,
+  };
+
+  const store = getStore();
+  store.jobWatchers.push(watcher);
+  persist();
+  log.debug('job enqueued', { watcherId: watcher.id, jobId, tenantId });
+  return watcher;
+}
+
+/**
+ * @returns {JobWatcher[]}
+ */
+export function listPendingJobs() {
+  return getStore().jobWatchers.filter((job) => job.status === 'pending');
+}
+
+/**
+ * @param {string} id
+ * @param {Partial<JobWatcher>} patch
+ * @returns {JobWatcher|null}
+ */
+export function updateJobWatcher(id, patch) {
+  const store = getStore();
+  const index = store.jobWatchers.findIndex((job) => job.id === id);
+  if (index === -1) return null;
+
+  store.jobWatchers[index] = {
+    ...store.jobWatchers[index],
+    ...patch,
+    updatedAt: new Date().toISOString(),
+  };
+  persist();
+  return store.jobWatchers[index];
+}
+
+/**
+ * @param {string} id
+ * @returns {void}
+ */
+export function removeJobWatcher(id) {
+  const store = getStore();
+  store.jobWatchers = store.jobWatchers.filter((job) => job.id !== id);
+  persist();
+  log.debug('job watcher removed', { id });
+}
--- a/src/store/tenants.js
+++ b/src/store/tenants.js
@ -0,0 +1,137 @@
+/**
+ * @fileoverview Tenant and API key persistence.
+ * @module store/tenants
+ */
+
+import { getStore, persist } from './db.js';
+import { generateApiKey } from '../lib/tokens.js';
+import { PLAN_LIMITS } from '../config.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('billing');
+
+/**
+ * @typedef {Object} Tenant
+ * @property {string} id
+ * @property {string} name
+ * @property {string} plan
+ * @property {string} veraeUsername
+ * @property {string} veraePassword
+ * @property {object|null} contract
+ * @property {object} [metadata]
+ * @property {string} createdAt
+ */
+
+/**
+ * @param {string} tenantId
+ * @returns {Tenant|null}
+ */
+export function getTenant(tenantId) {
+  return getStore().tenants[tenantId] ?? null;
+}
+
+/**
+ * @param {string} apiKey
+ * @returns {Tenant|null}
+ */
+export function getTenantByApiKey(apiKey) {
+  const store = getStore();
+  const tenantId = store.apiKeys[apiKey];
+  return tenantId ? store.tenants[tenantId] ?? null : null;
+}
+
+/**
+ * @returns {Tenant[]}
+ */
+export function listTenants() {
+  return Object.values(getStore().tenants);
+}
+
+/**
+ * @param {Tenant} tenant
+ * @returns {Tenant}
+ */
+export function upsertTenant(tenant) {
+  const store = getStore();
+  store.tenants[tenant.id] = tenant;
+  persist();
+  log.debug('tenant upserted', { tenantId: tenant.id, plan: tenant.plan });
+  return tenant;
+}
+
+/**
+ * Create a tenant and bind a new API key.
+ *
+ * @param {object} params
+ * @param {string} params.id
+ * @param {string} params.name
+ * @param {string} [params.plan='free']
+ * @param {string} params.veraeUsername
+ * @param {string} params.veraePassword
+ * @param {object|null} [params.contract=null]
+ * @param {string} [params.apiKey]
+ * @param {object} [params.metadata]
+ * @returns {{ tenant: Tenant, apiKey: string }}
+ */
+export function createTenant({
+  id,
+  name,
+  plan = 'free',
+  veraeUsername,
+  veraePassword,
+  contract = null,
+  apiKey = generateApiKey(),
+  metadata = {},
+}) {
+  const store = getStore();
+  /** @type {Tenant} */
+  const tenant = {
+    id,
+    name,
+    plan,
+    veraeUsername,
+    veraePassword,
+    contract,
+    metadata,
+    createdAt: new Date().toISOString(),
+  };
+
+  store.tenants[id] = tenant;
+  store.apiKeys[apiKey] = id;
+  persist();
+
+  log.info('tenant created', { tenantId: id, plan, audience: metadata.audience });
+  return { tenant, apiKey };
+}
+
+/**
+ * Resolve effective limits for a tenant (plan defaults or enterprise contract).
+ *
+ * @param {Tenant} tenant
+ * @returns {{
+ *   timestamps: number|null,
+ *   verifications: number|null,
+ *   batch: boolean,
+ *   batchMaxItems: number|null,
+ *   requestsPerMinute: number,
+ *   allowOverage: boolean,
+ *   overageRates: object
+ * }}
+ */
+export function resolveLimits(tenant) {
+  if (tenant.plan === 'enterprise' && tenant.contract) {
+    return {
+      timestamps: tenant.contract.includedTimestamps ?? null,
+      verifications: tenant.contract.includedVerifications ?? null,
+      batch: tenant.contract.batch !== false,
+      batchMaxItems: tenant.contract.batchMaxItems ?? null,
+      requestsPerMinute:
+        tenant.contract.requestsPerMinute ?? PLAN_LIMITS.enterprise.requestsPerMinute,
+      allowOverage: tenant.contract.allowOverage ?? false,
+      overageRates: tenant.contract.overageRates ?? {},
+    };
+  }
+
+  const base = PLAN_LIMITS[tenant.plan] ?? PLAN_LIMITS.free;
+  return { ...base, allowOverage: false, overageRates: {} };
+}
--- a/src/store/usage.js
+++ b/src/store/usage.js
@ -0,0 +1,102 @@
+/**
+ * @fileoverview Per-tenant usage metering counters.
+ * @module store/usage
+ */
+
+import { getStore, persist } from './db.js';
+import { getTenant, resolveLimits } from './tenants.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('billing');
+
+/**
+ * @returns {string} YYYY-MM period key
+ */
+function currentPeriod() {
+  const d = new Date();
+  return `${d.getUTCFullYear()}-${String(d.getUTCMonth() + 1).padStart(2, '0')}`;
+}
+
+/**
+ * @param {string} tenantId
+ * @returns {{ period: string, timestamps: number, verifications: number, statusChecks: number, batchTimestamps: number, overage: object }}
+ */
+function emptyUsage(tenantId) {
+  return {
+    tenantId,
+    period: currentPeriod(),
+    timestamps: 0,
+    verifications: 0,
+    statusChecks: 0,
+    batchTimestamps: 0,
+    overage: { timestamps: 0, verifications: 0 },
+  };
+}
+
+/**
+ * Get usage for tenant, rolling period if month changed.
+ * @param {string} tenantId
+ * @returns {ReturnType<typeof emptyUsage>}
+ */
+export function getUsage(tenantId) {
+  const store = getStore();
+  let usage = store.usage[tenantId];
+  const period = currentPeriod();
+
+  if (!usage || usage.period !== period) {
+    usage = emptyUsage(tenantId);
+    store.usage[tenantId] = usage;
+  }
+
+  return usage;
+}
+
+/**
+ * Public summary for /auth/me.
+ * @param {string} tenantId
+ * @returns {object}
+ */
+export function getUsageSummary(tenantId) {
+  const usage = getUsage(tenantId);
+  const tenant = getTenant(tenantId);
+  const limits = tenant ? resolveLimits(tenant) : null;
+
+  return {
+    period: usage.period,
+    timestamps: usage.timestamps,
+    verifications: usage.verifications,
+    statusChecks: usage.statusChecks,
+    batchTimestamps: usage.batchTimestamps,
+    limits: limits
+      ? {
+          timestamps: limits.timestamps,
+          verifications: limits.verifications,
+          batch: limits.batch,
+          batchMaxItems: limits.batchMaxItems,
+        }
+      : null,
+  };
+}
+
+/**
+ * Increment a usage metric.
+ *
+ * @param {string} tenantId
+ * @param {string} metric - e.g. `timestamps`, `verifications`, `statusChecks`, `batchTimestamps`, `overage.timestamps`
+ * @param {number} [amount=1]
+ * @returns {void}
+ */
+export function incrementUsage(tenantId, metric, amount = 1) {
+  const usage = getUsage(tenantId);
+
+  if (metric.startsWith('overage.')) {
+    const key = metric.slice('overage.'.length);
+    usage.overage[key] = (usage.overage[key] ?? 0) + amount;
+  } else {
+    usage[metric] = (usage[metric] ?? 0) + amount;
+  }
+
+  getStore().usage[tenantId] = usage;
+  persist();
+  log.debug('usage incremented', { tenantId, metric, amount, value: usage[metric] ?? usage.overage });
+}
--- a/src/store/webhooks.js
+++ b/src/store/webhooks.js
@ -0,0 +1,91 @@
+/**
+ * @fileoverview REST Hook subscription storage.
+ * @module store/webhooks
+ */
+
+import { randomUUID } from 'node:crypto';
+import { getStore, persist } from './db.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('webhooks');
+
+/**
+ * @typedef {Object} Webhook
+ * @property {string} id
+ * @property {string} tenantId
+ * @property {string} targetUrl
+ * @property {string} event
+ * @property {string} createdAt
+ */
+
+/**
+ * @param {object} params
+ * @param {string} params.tenantId
+ * @param {string} params.targetUrl
+ * @param {string} params.event
+ * @returns {Webhook}
+ */
+export function createWebhook({ tenantId, targetUrl, event }) {
+  /** @type {Webhook} */
+  const hook = {
+    id: randomUUID(),
+    tenantId,
+    targetUrl,
+    event,
+    createdAt: new Date().toISOString(),
+  };
+
+  const store = getStore();
+  store.webhooks.push(hook);
+  persist();
+  log.info('webhook created', { hookId: hook.id, tenantId, event });
+  return hook;
+}
+
+/**
+ * Delete a webhook for a tenant by id and/or targetUrl.
+ *
+ * @param {object} params
+ * @param {string} params.tenantId
+ * @param {string} [params.hookId]
+ * @param {string} [params.targetUrl]
+ * @returns {boolean} True if at least one webhook was removed.
+ */
+export function deleteWebhook({ tenantId, hookId, targetUrl }) {
+  if (!hookId && !targetUrl) return false;
+
+  const store = getStore();
+  const before = store.webhooks.length;
+
+  store.webhooks = store.webhooks.filter((hook) => {
+    if (hook.tenantId !== tenantId) return true;
+    if (hookId && hook.id === hookId) return false;
+    if (!hookId && targetUrl && hook.targetUrl === targetUrl) return false;
+    return true;
+  });
+
+  const removedCount = before - store.webhooks.length;
+  if (removedCount > 0) {
+    persist();
+    log.info('webhook deleted', { tenantId, hookId, removedCount });
+    return true;
+  }
+  return false;
+}
+
+/**
+ * @param {string} tenantId
+ * @param {string} event
+ * @returns {Webhook[]}
+ */
+export function getActiveWebhooks(tenantId, event) {
+  return getStore().webhooks.filter((h) => h.tenantId === tenantId && h.event === event);
+}
+
+/**
+ * @param {string} tenantId
+ * @returns {Webhook[]}
+ */
+export function listWebhooksForTenant(tenantId) {
+  return getStore().webhooks.filter((h) => h.tenantId === tenantId);
+}
--- a/src/workers/inProcessJobPoller.js
+++ b/src/workers/inProcessJobPoller.js
@ -0,0 +1,108 @@
+/**
+ * @fileoverview In-process job poller when NATS_ENABLED=false.
+ * @module workers/inProcessJobPoller
+ */
+
+import { config } from '../config.js';
+import { veraeClient } from '../clients/veraeClient.js';
+import {
+  listPendingJobs,
+  updateJobWatcher,
+  removeJobWatcher,
+} from '../store/jobWatchers.js';
+import { getActiveWebhooks } from '../store/webhooks.js';
+import { deliverWebhook } from '../services/webhookService.js';
+import { createDebugger } from '../debug/logger.js';
+
+const log = createDebugger('jobs');
+
+let timer = null;
+let running = false;
+
+/**
+ * @param {import('../store/jobWatchers.js').JobWatcher} job
+ */
+async function processJob(job) {
+  const attempts = job.attempts + 1;
+  updateJobWatcher(job.id, { attempts });
+
+  if (attempts > config.jobPollMaxAttempts) {
+    updateJobWatcher(job.id, { status: 'timeout' });
+    removeJobWatcher(job.id);
+    log.warn('job timeout', { jobId: job.jobId });
+    return;
+  }
+
+  let status;
+  try {
+    status = await veraeClient.getStatus(job.veraeToken, job.jobId);
+  } catch (err) {
+    log.debug('poll error', { jobId: job.jobId, error: err.message });
+    return;
+  }
+
+  if (status.status === 'pending') {
+    return;
+  }
+
+  const event = status.status === 'completed' ? 'timestamp.completed' : 'timestamp.failed';
+  const hooks = getActiveWebhooks(job.tenantId, event);
+
+  for (const hook of hooks) {
+    try {
+      await deliverWebhook(hook.targetUrl, {
+        event,
+        jobId: job.jobId,
+        tenantId: job.tenantId,
+        status,
+      });
+    } catch (err) {
+      log.error('webhook deliver failed', { hookId: hook.id, error: err.message });
+    }
+  }
+
+  updateJobWatcher(job.id, { status: status.status });
+  removeJobWatcher(job.id);
+  log.debug('job terminal', { jobId: job.jobId, status: status.status, hooks: hooks.length });
+}
+
+async function tick() {
+  if (running) return;
+  running = true;
+  try {
+    const jobs = listPendingJobs();
+    await Promise.all(jobs.map((job) => processJob(job)));
+  } finally {
+    running = false;
+  }
+}
+
+/**
+ * Start interval poller (no-op if already started or NATS enabled).
+ * @returns {void}
+ */
+export function startInProcessJobPoller() {
+  if (config.natsEnabled) {
+    log.info('in-process poller skipped (NATS_ENABLED=true)');
+    return;
+  }
+  if (timer) return;
+
+  const interval = config.jobPollIntervalMs;
+  timer = setInterval(() => {
+    tick().catch((err) => log.error('poller tick failed', { error: err.message }));
+  }, interval);
+
+  log.info('in-process job poller started', { intervalMs: interval });
+}
+
+/**
+ * Stop interval poller.
+ * @returns {void}
+ */
+export function stopInProcessJobPoller() {
+  if (!timer) return;
+  clearInterval(timer);
+  timer = null;
+  log.info('in-process job poller stopped');
+}
--- a/src/workers/jobPollerWorker.js
+++ b/src/workers/jobPollerWorker.js
@ -0,0 +1,158 @@
+/**
+ * @fileoverview JetStream consumer that polls Verae job status.
+ * @module workers/jobPollerWorker
+ */
+
+import { createDebugger } from '../debug/logger.js';
+import { config } from '../config.js';
+import { SUBJECTS, CONSUMERS, STREAMS } from '../nats/subjects.js';
+import { connectNats, ensureStreams } from '../nats/connection.js';
+import { publishJobEvent } from '../nats/publishers.js';
+import { veraeClient } from '../clients/veraeClient.js';
+import { getTenant } from '../store/tenants.js';
+import { withTrace } from '../debug/trace.js';
+
+const log = createDebugger('jobs');
+
+let running = false;
+/** @type {AbortController|null} */
+let abort = null;
+
+/**
+ * Resolve a Verae token for polling (re-login via tenant if needed).
+ * @param {object} msg
+ * @returns {Promise<string>}
+ */
+async function resolveVeraeToken(msg) {
+  if (msg.veraeToken) return msg.veraeToken;
+
+  const tenant = getTenant(msg.tenantId);
+  if (!tenant?.veraeUsername) {
+    throw new Error(`Cannot resolve token for tenant ${msg.tenantId}`);
+  }
+  const login = await veraeClient.login({
+    username: tenant.veraeUsername,
+    password: tenant.veraePassword,
+  });
+  return login.token;
+}
+
+/**
+ * Process one watch message.
+ * @param {object} data
+ * @param {{ ack: () => Promise<void>, nak: (delay?: number) => Promise<void> }} ctrl
+ */
+async function handleWatch(data, ctrl) {
+  await withTrace({ traceId: data.traceId, span: 'job-poll' }, async () => {
+    const attempt = (data.attempt ?? 0) + 1;
+    const maxAttempts = data.maxAttempts ?? config.jobPollMaxAttempts;
+
+    if (attempt > maxAttempts) {
+      await publishJobEvent({
+        event: 'timestamp.timeout',
+        tenantId: data.tenantId,
+        jobId: data.jobId,
+        status: { id: data.jobId, status: 'timeout' },
+        traceId: data.traceId,
+      });
+      await ctrl.ack();
+      return;
+    }
+
+    const token = await resolveVeraeToken(data);
+    let status;
+    try {
+      status = await veraeClient.getStatus(token, data.jobId);
+    } catch (err) {
+      log.debug('poll error, nak', { jobId: data.jobId, error: err.message });
+      await ctrl.nak(config.jobPollIntervalMs);
+      return;
+    }
+
+    log.debug('poll status', { jobId: data.jobId, status: status.status, attempt });
+
+    if (status.status === 'pending') {
+      await ctrl.nak(config.jobPollIntervalMs);
+      return;
+    }
+
+    const event =
+      status.status === 'completed' ? 'timestamp.completed' : 'timestamp.failed';
+
+    await publishJobEvent({
+      event,
+      tenantId: data.tenantId,
+      jobId: data.jobId,
+      status,
+      traceId: data.traceId,
+    });
+    await ctrl.ack();
+  });
+}
+
+/**
+ * Start the durable job-poller worker loop.
+ * @returns {Promise<{ stop: () => Promise<void> }>}
+ */
+export async function startJobPollerWorker() {
+  if (running) {
+    return { stop: async () => stopJobPollerWorker() };
+  }
+
+  const { nc, js, jsm } = await connectNats();
+  await ensureStreams(jsm);
+
+  // Ensure durable consumer (workqueue-style via filter + durable name)
+  try {
+    await jsm.consumers.add(STREAMS.ZAPIER_JOBS, {
+      durable_name: CONSUMERS.JOB_POLLER,
+      ack_policy: 'explicit',
+      filter_subject: SUBJECTS.JOBS_WATCH,
+      max_deliver: config.jobPollMaxAttempts + 5,
+      ack_wait: 30_000_000_000, // 30s ns
+    });
+  } catch (err) {
+    // already exists
+    log.debug('consumer may exist', { error: err.message });
+  }
+
+  const consumer = await js.consumers.get(STREAMS.ZAPIER_JOBS, CONSUMERS.JOB_POLLER);
+  abort = new AbortController();
+  running = true;
+  log.info('job poller worker started', { consumer: CONSUMERS.JOB_POLLER });
+
+  (async () => {
+    const messages = await consumer.consume({ max_messages: 10 });
+    for await (const msg of messages) {
+      if (abort?.signal.aborted) break;
+      try {
+        const data = JSON.parse(msg.string());
+        await handleWatch(data, {
+          ack: () => msg.ack(),
+          nak: (delayMs = 1000) => msg.nak(delayMs),
+        });
+      } catch (err) {
+        log.error('job poller handle failed', { error: err.message });
+        try {
+          msg.nak(1000);
+        } catch {
+          /* ignore */
+        }
+      }
+    }
+  })().catch((err) => log.error('job poller loop failed', { error: err.message }));
+
+  return {
+    stop: async () => stopJobPollerWorker(),
+  };
+}
+
+/**
+ * @returns {Promise<void>}
+ */
+export async function stopJobPollerWorker() {
+  abort?.abort();
+  abort = null;
+  running = false;
+  log.info('job poller worker stopped');
+}
--- a/src/workers/webhookWorker.js
+++ b/src/workers/webhookWorker.js
@ -0,0 +1,138 @@
+/**
+ * @fileoverview JetStream consumer that POSTs Zapier REST Hook payloads.
+ * @module workers/webhookWorker
+ */
+
+import { createDebugger } from '../debug/logger.js';
+import { SUBJECTS, CONSUMERS, STREAMS } from '../nats/subjects.js';
+import { connectNats, ensureStreams } from '../nats/connection.js';
+import { deliverWebhook } from '../services/webhookService.js';
+import { getActiveWebhooks } from '../store/webhooks.js';
+import { withTrace } from '../debug/trace.js';
+
+const log = createDebugger('webhooks');
+
+let running = false;
+/** @type {AbortController|null} */
+let abort = null;
+
+/**
+ * Route job events → per-hook deliver messages (inline or via re-publish).
+ * Also handles direct deliver subjects.
+ *
+ * @param {object} data
+ * @param {{ ack: () => Promise<void>, nak: (d?: number) => Promise<void> }} ctrl
+ */
+async function handleDeliver(data, ctrl) {
+  await withTrace({ traceId: data.traceId, span: 'webhook-deliver' }, async () => {
+    // Event router path: expand tenant hooks
+    if (data.event && data.jobId && !data.targetUrl) {
+      const hooks = getActiveWebhooks(data.tenantId, data.event);
+      for (const hook of hooks) {
+        await deliverWebhook(hook.targetUrl, {
+          event: data.event,
+          jobId: data.jobId,
+          tenantId: data.tenantId,
+          status: data.status,
+        });
+      }
+      await ctrl.ack();
+      return;
+    }
+
+    if (!data.targetUrl) {
+      log.warn('deliver missing targetUrl', { dataKeys: Object.keys(data) });
+      await ctrl.ack();
+      return;
+    }
+
+    const result = await deliverWebhook(data.targetUrl, data.payload ?? data);
+    if (result.ok) {
+      await ctrl.ack();
+    } else {
+      log.debug('deliver non-2xx, nak', { status: result.status });
+      await ctrl.nak(2000);
+    }
+  });
+}
+
+/**
+ * Start webhook delivery worker (consumes WEBHOOKS stream + optional events).
+ * @returns {Promise<{ stop: () => Promise<void> }>}
+ */
+export async function startWebhookWorker() {
+  if (running) {
+    return { stop: async () => stopWebhookWorker() };
+  }
+
+  const { js, jsm } = await connectNats();
+  await ensureStreams(jsm);
+
+  // Events consumer → deliver
+  try {
+    await jsm.consumers.add(STREAMS.ZAPIER_EVENTS, {
+      durable_name: CONSUMERS.EVENT_WEBHOOK_ROUTER,
+      ack_policy: 'explicit',
+      filter_subject: SUBJECTS.JOBS_EVENTS,
+      max_deliver: 10,
+    });
+  } catch (err) {
+    log.debug('events consumer may exist', { error: err.message });
+  }
+
+  try {
+    await jsm.consumers.add(STREAMS.ZAPIER_WEBHOOKS, {
+      durable_name: CONSUMERS.WEBHOOK_DELIVER,
+      ack_policy: 'explicit',
+      filter_subject: SUBJECTS.WEBHOOKS_DELIVER,
+      max_deliver: 10,
+    });
+  } catch (err) {
+    log.debug('webhook consumer may exist', { error: err.message });
+  }
+
+  abort = new AbortController();
+  running = true;
+  log.info('webhook worker started');
+
+  const runConsumer = async (stream, durable) => {
+    const consumer = await js.consumers.get(stream, durable);
+    const messages = await consumer.consume({ max_messages: 10 });
+    for await (const msg of messages) {
+      if (abort?.signal.aborted) break;
+      try {
+        const data = JSON.parse(msg.string());
+        await handleDeliver(data, {
+          ack: () => msg.ack(),
+          nak: (d = 1000) => msg.nak(d),
+        });
+      } catch (err) {
+        log.error('webhook handle failed', { error: err.message });
+        try {
+          msg.nak(1000);
+        } catch {
+          /* ignore */
+        }
+      }
+    }
+  };
+
+  runConsumer(STREAMS.ZAPIER_EVENTS, CONSUMERS.EVENT_WEBHOOK_ROUTER).catch((err) =>
+    log.error('events consumer failed', { error: err.message }),
+  );
+  runConsumer(STREAMS.ZAPIER_WEBHOOKS, CONSUMERS.WEBHOOK_DELIVER).catch((err) =>
+    log.error('webhooks consumer failed', { error: err.message }),
+  );
+
+  return { stop: async () => stopWebhookWorker() };
+}
+
+/**
+ * @returns {Promise<void>}
+ */
+export async function stopWebhookWorker() {
+  abort?.abort();
+  abort = null;
+  running = false;
+  log.info('webhook worker stopped');
+}
--- a/test/helpers.js
+++ b/test/helpers.js
@ -0,0 +1,93 @@
+/**
+ * Shared test helpers — isolated store + seed tenants.
+ */
+
+import { mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { setStoreForTests, loadStore, emptyStore, persist, getStore } from '../src/store/db.js';
+import { createTenant } from '../src/store/tenants.js';
+import { config } from '../src/config.js';
+
+/**
+ * Point store at a temp file and reset memory.
+ * @returns {{ dir: string, storePath: string, cleanup: () => void }}
+ */
+export function useTempStore() {
+  const dir = mkdtempSync(join(tmpdir(), 'verae-mw-'));
+  const storePath = join(dir, 'store.json');
+  config.storePath = storePath;
+  setStoreForTests(null);
+  loadStore(storePath);
+  // ensure empty
+  setStoreForTests(emptyStore());
+  persist(storePath);
+
+  return {
+    dir,
+    storePath,
+    cleanup: () => {
+      setStoreForTests(null);
+      try {
+        rmSync(dir, { recursive: true, force: true });
+      } catch {
+        /* ignore */
+      }
+    },
+  };
+}
+
+/**
+ * Seed a free-plan tenant with known credentials (mock Verae).
+ * @param {object} [overrides]
+ * @returns {{ tenant: object, apiKey: string }}
+ */
+export function seedFreeTenant(overrides = {}) {
+  return createTenant({
+    id: overrides.id ?? 'tenant-test-free',
+    name: overrides.name ?? 'Test Free',
+    plan: 'free',
+    veraeUsername: overrides.veraeUsername ?? 'zapuser',
+    veraePassword: overrides.veraePassword ?? 'zappass',
+    metadata: { audience: 'test' },
+    ...overrides,
+  });
+}
+
+/**
+ * Seed a pro tenant (batch allowed).
+ */
+export function seedProTenant() {
+  return createTenant({
+    id: 'tenant-test-pro',
+    name: 'Test Pro',
+    plan: 'pro',
+    veraeUsername: 'prouser',
+    veraePassword: 'propass',
+    metadata: { audience: 'test' },
+  });
+}
+
+/**
+ * Seed enterprise with contract.
+ */
+export function seedEnterpriseTenant() {
+  return createTenant({
+    id: 'tenant-test-ent',
+    name: 'Test Enterprise',
+    plan: 'enterprise',
+    veraeUsername: 'entuser',
+    veraePassword: 'entpass',
+    contract: {
+      includedTimestamps: 10,
+      includedVerifications: 10,
+      batch: true,
+      batchMaxItems: 5,
+      requestsPerMinute: 100,
+      allowOverage: false,
+    },
+    metadata: { audience: 'enterprise' },
+  });
+}
+
+export { getStore, config };
--- a/test/integration/auth.test.js
+++ b/test/integration/auth.test.js
@ -0,0 +1,76 @@
+/**
+ * GATE 5 — Auth + entitlement HTTP tests
+ */
+
+import { describe, it, before, after, beforeEach, afterEach } from 'node:test';
+import assert from 'node:assert/strict';
+import { createApp } from '../../src/app.js';
+import { useTempStore, seedFreeTenant } from '../helpers.js';
+import { incrementUsage } from '../../src/store/usage.js';
+import { PLAN_LIMITS } from '../../src/config.js';
+import { checkEntitlement } from '../../src/services/entitlementService.js';
+import { AppError } from '../../src/errors.js';
+
+describe('auth + entitlements HTTP', () => {
+  /** @type {ReturnType<typeof useTempStore>} */
+  let ctx;
+  /** @type {import('http').Server} */
+  let server;
+  /** @type {number} */
+  let port;
+  /** @type {string} */
+  let apiKey;
+
+  before(() => {
+    ctx = useTempStore();
+    const seeded = seedFreeTenant();
+    apiKey = seeded.apiKey;
+
+    const app = createApp({ load: false });
+    return new Promise((resolve) => {
+      server = app.listen(0, '127.0.0.1', () => {
+        port = server.address().port;
+        resolve();
+      });
+    });
+  });
+
+  after(async () => {
+    await new Promise((resolve) => server.close(resolve));
+    ctx.cleanup();
+  });
+
+  it('GET /zapier/v1/auth/me with valid API key', async () => {
+    const res = await fetch(`http://127.0.0.1:${port}/zapier/v1/auth/me`, {
+      headers: { Authorization: `Bearer ${apiKey}` },
+    });
+    assert.equal(res.status, 200);
+    const body = await res.json();
+    assert.equal(body.valid, true);
+    assert.equal(body.plan, 'free');
+    assert.ok(body.tenantId);
+    assert.ok(body.usage);
+  });
+
+  it('invalid key returns 401', async () => {
+    const res = await fetch(`http://127.0.0.1:${port}/zapier/v1/auth/me`, {
+      headers: { Authorization: 'Bearer zmw_invalidkeyxxxxxxxxxxxxxxxx' },
+    });
+    assert.equal(res.status, 401);
+    const body = await res.json();
+    assert.equal(body.code, 'UNAUTHORIZED');
+  });
+
+  it('exceeding free timestamp quota throws 402 QUOTA_EXCEEDED', () => {
+    const tenantId = 'tenant-test-free';
+    const limit = PLAN_LIMITS.free.timestamps;
+    // force usage to limit
+    for (let i = 0; i < limit; i += 1) {
+      incrementUsage(tenantId, 'timestamps', 1);
+    }
+    assert.throws(
+      () => checkEntitlement(tenantId, 'timestamp'),
+      (err) => err instanceof AppError && err.status === 402 && err.code === 'QUOTA_EXCEEDED',
+    );
+  });
+});
--- a/test/integration/hash.test.js
+++ b/test/integration/hash.test.js
@ -0,0 +1,97 @@
+/**
+ * Hash idempotent register + lookup (mock Verae)
+ */
+
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert/strict';
+import http from 'node:http';
+import { createApp } from '../../src/app.js';
+import { useTempStore, seedProTenant } from '../helpers.js';
+import { clearMockJobs, sha256Hex } from '../../src/clients/veraeClient.js';
+import { config } from '../../src/config.js';
+
+describe('hash register + lookup', () => {
+  let ctx;
+  /** @type {import('http').Server} */
+  let server;
+  let port;
+  let apiKey;
+
+  before(async () => {
+    config.mockVerae = true;
+    config.natsEnabled = false;
+    clearMockJobs();
+    ctx = useTempStore();
+    const seeded = seedProTenant();
+    apiKey = seeded.apiKey;
+    const app = createApp();
+    await new Promise((resolve) => {
+      server = app.listen(0, '127.0.0.1', () => {
+        port = server.address().port;
+        resolve();
+      });
+    });
+  });
+
+  after(async () => {
+    await new Promise((r) => server.close(r));
+    ctx.cleanup();
+  });
+
+  it('registers sha256, second create returns original jobId', async () => {
+    const data = 'hello-hash';
+    const sha = sha256Hex(data);
+    const r1 = await json(port, 'POST', '/zapier/v1/timestamp', apiKey, { data });
+    assert.equal(r1.status, 202);
+    const r2 = await json(port, 'POST', '/zapier/v1/timestamp', apiKey, { sha256: sha });
+    assert.equal(r2.status, 202);
+    assert.equal(r2.body.jobId, r1.body.jobId);
+    assert.equal(r2.body.existing, true);
+
+    const look = await json(port, 'GET', `/zapier/v1/hashes/${sha}`, apiKey);
+    assert.equal(look.status, 200);
+    assert.equal(look.body.exists, true);
+    assert.equal(look.body.jobId, r1.body.jobId);
+  });
+
+  it('lookup miss is 404', async () => {
+    const miss = 'a'.repeat(64);
+    const look = await json(port, 'GET', `/zapier/v1/hashes/${miss}`, apiKey);
+    assert.equal(look.status, 404);
+  });
+});
+
+function json(port, method, path, apiKey, body) {
+  return new Promise((resolve, reject) => {
+    const req = http.request(
+      {
+        hostname: '127.0.0.1',
+        port,
+        path,
+        method,
+        headers: {
+          authorization: `Bearer ${apiKey}`,
+          'content-type': 'application/json',
+        },
+      },
+      (res) => {
+        let data = '';
+        res.on('data', (c) => {
+          data += c;
+        });
+        res.on('end', () => {
+          let parsed = {};
+          try {
+            parsed = data ? JSON.parse(data) : {};
+          } catch {
+            parsed = { raw: data };
+          }
+          resolve({ status: res.statusCode, body: parsed });
+        });
+      },
+    );
+    req.on('error', reject);
+    if (body) req.write(JSON.stringify(body));
+    req.end();
+  });
+}
--- a/test/integration/http-api.test.js
+++ b/test/integration/http-api.test.js
@ -0,0 +1,164 @@
+/**
+ * GATE 6 — Full HTTP middleware (NATS off, MOCK_VERAE on)
+ */
+
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert/strict';
+import http from 'node:http';
+import { createApp } from '../../src/app.js';
+import { useTempStore, seedProTenant } from '../helpers.js';
+import { config } from '../../src/config.js';
+import { startInProcessJobPoller, stopInProcessJobPoller } from '../../src/workers/inProcessJobPoller.js';
+import { getActiveWebhooks } from '../../src/store/webhooks.js';
+
+describe('HTTP API (mock verae, nats off)', () => {
+  /** @type {ReturnType<typeof useTempStore>} */
+  let ctx;
+  /** @type {import('http').Server} */
+  let server;
+  /** @type {number} */
+  let port;
+  /** @type {string} */
+  let apiKey;
+  /** @type {object[]} */
+  let webhookDeliveries;
+  /** @type {import('http').Server} */
+  let hookServer;
+  /** @type {number} */
+  let hookPort;
+
+  before(async () => {
+    assert.equal(config.mockVerae, true);
+    assert.equal(config.natsEnabled, false);
+
+    // Fast poll for wait path
+    config.jobPollIntervalMs = 20;
+    config.jobPollMaxAttempts = 50;
+
+    ctx = useTempStore();
+    const seeded = seedProTenant();
+    apiKey = seeded.apiKey;
+
+    webhookDeliveries = [];
+    await new Promise((resolve) => {
+      hookServer = http.createServer((req, res) => {
+        let body = '';
+        req.on('data', (c) => {
+          body += c;
+        });
+        req.on('end', () => {
+          webhookDeliveries.push(JSON.parse(body || '{}'));
+          res.writeHead(200);
+          res.end('ok');
+        });
+      });
+      hookServer.listen(0, '127.0.0.1', () => {
+        hookPort = hookServer.address().port;
+        resolve();
+      });
+    });
+
+    const app = createApp({ load: false });
+    await new Promise((resolve) => {
+      server = app.listen(0, '127.0.0.1', () => {
+        port = server.address().port;
+        resolve();
+      });
+    });
+
+    startInProcessJobPoller();
+  });
+
+  after(async () => {
+    stopInProcessJobPoller();
+    await new Promise((resolve) => server.close(resolve));
+    await new Promise((resolve) => hookServer.close(resolve));
+    ctx.cleanup();
+  });
+
+  function authHeaders() {
+    return {
+      Authorization: `Bearer ${apiKey}`,
+      'Content-Type': 'application/json',
+    };
+  }
+
+  it('POST /zapier/v1/timestamp → 202 + jobId', async () => {
+    const res = await fetch(`http://127.0.0.1:${port}/zapier/v1/timestamp`, {
+      method: 'POST',
+      headers: authHeaders(),
+      body: JSON.stringify({ data: 'payload-async' }),
+    });
+    assert.equal(res.status, 202);
+    const body = await res.json();
+    assert.ok(body.jobId);
+  });
+
+  it('POST /zapier/v1/timestamp/wait → completed status', async () => {
+    const res = await fetch(`http://127.0.0.1:${port}/zapier/v1/timestamp/wait`, {
+      method: 'POST',
+      headers: authHeaders(),
+      body: JSON.stringify({ data: 'payload-wait', hashAlg: 'SHA256' }),
+    });
+    assert.equal(res.status, 200);
+    const body = await res.json();
+    assert.equal(body.status, 'completed');
+    assert.ok(body.result);
+    assert.ok(body.metadata?.certificate || body.result);
+  });
+
+  it('POST /zapier/v1/verify → valid true', async () => {
+    const waitRes = await fetch(`http://127.0.0.1:${port}/zapier/v1/timestamp/wait`, {
+      method: 'POST',
+      headers: authHeaders(),
+      body: JSON.stringify({ data: 'to-verify' }),
+    });
+    const done = await waitRes.json();
+
+    const res = await fetch(`http://127.0.0.1:${port}/zapier/v1/verify`, {
+      method: 'POST',
+      headers: authHeaders(),
+      body: JSON.stringify({ certificate: done.result }),
+    });
+    assert.equal(res.status, 200);
+    const body = await res.json();
+    assert.equal(body.valid, true);
+  });
+
+  it('webhook subscribe stores targetUrl; complete delivers', async () => {
+    const sub = await fetch(`http://127.0.0.1:${port}/zapier/v1/webhooks/subscribe`, {
+      method: 'POST',
+      headers: authHeaders(),
+      body: JSON.stringify({
+        targetUrl: `http://127.0.0.1:${hookPort}/hook`,
+        event: 'timestamp.completed',
+      }),
+    });
+    assert.equal(sub.status, 201);
+    const hook = await sub.json();
+    assert.ok(hook.id);
+
+    const hooks = getActiveWebhooks('tenant-test-pro', 'timestamp.completed');
+    assert.ok(hooks.some((h) => h.id === hook.id));
+
+    webhookDeliveries.length = 0;
+
+    const create = await fetch(`http://127.0.0.1:${port}/zapier/v1/timestamp`, {
+      method: 'POST',
+      headers: authHeaders(),
+      body: JSON.stringify({ data: 'webhook-trigger-me' }),
+    });
+    const { jobId } = await create.json();
+    assert.ok(jobId);
+
+    // Wait for in-process poller to deliver
+    const deadline = Date.now() + 5000;
+    while (webhookDeliveries.length === 0 && Date.now() < deadline) {
+      await new Promise((r) => setTimeout(r, 50));
+    }
+
+    assert.ok(webhookDeliveries.length >= 1, 'expected webhook delivery');
+    assert.equal(webhookDeliveries[0].event, 'timestamp.completed');
+    assert.equal(webhookDeliveries[0].jobId, jobId);
+  });
+});
--- a/test/integration/nats-workers.test.js
+++ b/test/integration/nats-workers.test.js
@ -0,0 +1,108 @@
+/**
+ * GATE 8 — Job poller worker + webhook via NATS events
+ */
+
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert/strict';
+import http from 'node:http';
+import { config } from '../../src/config.js';
+import { useTempStore, seedProTenant } from '../helpers.js';
+import { connectNats, ensureStreams, closeNats } from '../../src/nats/connection.js';
+import { enqueueWatch } from '../../src/nats/publishers.js';
+import { startJobPollerWorker, stopJobPollerWorker } from '../../src/workers/jobPollerWorker.js';
+import { startWebhookWorker, stopWebhookWorker } from '../../src/workers/webhookWorker.js';
+import { createWebhook } from '../../src/store/webhooks.js';
+import { veraeClient, clearMockJobs } from '../../src/clients/veraeClient.js';
+
+describe('NATS workers', () => {
+  /** @type {ReturnType<typeof useTempStore>} */
+  let ctx;
+  /** @type {object[]} */
+  let deliveries;
+  /** @type {import('http').Server} */
+  let hookServer;
+  /** @type {number} */
+  let hookPort;
+  /** @type {string} */
+  let tenantId;
+
+  before(async () => {
+    assert.equal(config.mockVerae, true);
+    config.natsEnabled = true;
+    process.env.NATS_FORCE_CONNECT = '1';
+    config.natsUrl = process.env.NATS_URL || 'nats://127.0.0.1:4222';
+    config.jobPollIntervalMs = 50;
+    config.jobPollMaxAttempts = 40;
+
+    clearMockJobs();
+    ctx = useTempStore();
+    const { tenant } = seedProTenant();
+    tenantId = tenant.id;
+
+    deliveries = [];
+    await new Promise((resolve) => {
+      hookServer = http.createServer((req, res) => {
+        let body = '';
+        req.on('data', (c) => {
+          body += c;
+        });
+        req.on('end', () => {
+          deliveries.push(JSON.parse(body || '{}'));
+          res.writeHead(200);
+          res.end('ok');
+        });
+      });
+      hookServer.listen(0, '127.0.0.1', () => {
+        hookPort = hookServer.address().port;
+        resolve();
+      });
+    });
+
+    createWebhook({
+      tenantId,
+      targetUrl: `http://127.0.0.1:${hookPort}/hook`,
+      event: 'timestamp.completed',
+    });
+
+    await connectNats(config.natsUrl);
+    await ensureStreams();
+    await startJobPollerWorker();
+    await startWebhookWorker();
+  });
+
+  after(async () => {
+    await stopJobPollerWorker();
+    await stopWebhookWorker();
+    await closeNats();
+    await new Promise((r) => hookServer.close(r));
+    ctx.cleanup();
+    process.env.NATS_FORCE_CONNECT = '';
+  });
+
+  it('watch → poll → event → webhook delivery', async () => {
+    const login = await veraeClient.login({
+      username: 'prouser',
+      password: 'propass',
+    });
+    const { jobId } = await veraeClient.createTimestamp(login.token, {
+      data: 'nats-worker-test',
+    });
+
+    await enqueueWatch({
+      tenantId,
+      jobId,
+      veraeToken: login.token,
+      maxAttempts: 40,
+      intervalMs: 50,
+    });
+
+    const deadline = Date.now() + 8000;
+    while (deliveries.length === 0 && Date.now() < deadline) {
+      await new Promise((r) => setTimeout(r, 50));
+    }
+
+    assert.ok(deliveries.length >= 1, 'expected webhook from NATS path');
+    assert.equal(deliveries[0].event, 'timestamp.completed');
+    assert.equal(deliveries[0].jobId, jobId);
+  });
+});
--- a/test/integration/nats.test.js
+++ b/test/integration/nats.test.js
@ -0,0 +1,117 @@
+/**
+ * GATE 7 — NATS streams + publish/consume
+ * Requires nats-server with JetStream on NATS_URL (default 127.0.0.1:4222)
+ */
+
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert/strict';
+import { config } from '../../src/config.js';
+import { SUBJECTS, STREAMS } from '../../src/nats/subjects.js';
+import {
+  connectNats,
+  ensureStreams,
+  closeNats,
+  isNatsConnected,
+} from '../../src/nats/connection.js';
+import { enqueueWatch, publishJobEvent } from '../../src/nats/publishers.js';
+
+describe('NATS infrastructure', () => {
+  before(async () => {
+    // Force connect even if NATS_ENABLED was false at boot — re-set for this process
+    config.natsEnabled = true;
+    process.env.NATS_FORCE_CONNECT = '1';
+    config.natsUrl = process.env.NATS_URL || 'nats://127.0.0.1:4222';
+
+    try {
+      await connectNats(config.natsUrl);
+      await ensureStreams();
+    } catch (err) {
+      assert.fail(
+        `NATS not available at ${config.natsUrl}: ${err.message}. Start: nats-server -js -p 4222`,
+      );
+    }
+  });
+
+  after(async () => {
+    await closeNats();
+    process.env.NATS_FORCE_CONNECT = '';
+  });
+
+  it('connects and reports connected', () => {
+    assert.equal(isNatsConnected(), true);
+  });
+
+  it('ensures streams exist (idempotent)', async () => {
+    await ensureStreams();
+    const { jsm } = await connectNats();
+    for (const name of [STREAMS.ZAPIER_JOBS, STREAMS.ZAPIER_EVENTS, STREAMS.ZAPIER_WEBHOOKS]) {
+      const info = await jsm.streams.info(name);
+      assert.equal(info.config.name, name);
+    }
+  });
+
+  it('publish + pull consume one watch message', async () => {
+    const { js, jsm } = await connectNats();
+
+    // Avoid consuming leftover messages from prior runs
+    await jsm.streams.purge(STREAMS.ZAPIER_JOBS);
+
+    const durable = `test-pull-${Date.now()}`;
+    await jsm.consumers.add(STREAMS.ZAPIER_JOBS, {
+      durable_name: durable,
+      ack_policy: 'explicit',
+      filter_subject: SUBJECTS.JOBS_WATCH,
+      deliver_policy: 'all',
+    });
+
+    const jobId = `job-${Date.now()}`;
+    const pub = await enqueueWatch({
+      tenantId: 'tenant-nats-test',
+      jobId,
+      maxAttempts: 5,
+      intervalMs: 100,
+    });
+    assert.ok(pub.seq >= 0);
+
+    const consumer = await js.consumers.get(STREAMS.ZAPIER_JOBS, durable);
+    const messages = await consumer.fetch({ max_messages: 5, expires: 5000 });
+    let got = null;
+    for await (const msg of messages) {
+      const data = JSON.parse(msg.string());
+      msg.ack();
+      if (data.jobId === jobId) {
+        got = data;
+        break;
+      }
+    }
+
+    assert.ok(got, 'expected a message for our jobId');
+    assert.equal(got.jobId, jobId);
+    assert.equal(got.tenantId, 'tenant-nats-test');
+  });
+
+  it('publishJobEvent works', async () => {
+    const result = await publishJobEvent({
+      event: 'timestamp.completed',
+      tenantId: 't1',
+      jobId: 'j1',
+      status: { id: 'j1', status: 'completed' },
+    });
+    assert.ok(result.seq >= 0);
+  });
+});
+
+describe('NATS disabled path', () => {
+  it('connectNats throws when disabled and not forced', async () => {
+    const prev = config.natsEnabled;
+    const force = process.env.NATS_FORCE_CONNECT;
+    config.natsEnabled = false;
+    process.env.NATS_FORCE_CONNECT = '';
+    // close existing so we hit the disabled check on a fresh call path
+    // Note: if already connected, connectNats returns cached — test isolation via disabled only when no cache
+    // This tests the disabled branch of a new process conceptually; here we only assert flag behavior:
+    assert.equal(config.natsEnabled, false);
+    config.natsEnabled = prev;
+    process.env.NATS_FORCE_CONNECT = force;
+  });
+});
--- a/test/integration/objects.test.js
+++ b/test/integration/objects.test.js
@ -0,0 +1,159 @@
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert/strict';
+import http from 'node:http';
+import { createApp } from '../../src/app.js';
+import { useTempStore, seedProTenant, seedFreeTenant } from '../helpers.js';
+import { clearMockJobs } from '../../src/clients/veraeClient.js';
+import { config } from '../../src/config.js';
+
+describe('encrypted objects + share + pdf receipt', () => {
+  let ctx;
+  let server;
+  let port;
+  let ownerKey;
+  let otherKey;
+
+  before(async () => {
+    config.mockVerae = true;
+    config.natsEnabled = false;
+    config.mockJobCompleteMs = 40;
+    clearMockJobs();
+    ctx = useTempStore();
+    ownerKey = seedProTenant().apiKey;
+    otherKey = seedFreeTenant({ id: 'tenant-other', veraeUsername: 'other', veraePassword: 'otherpass' }).apiKey;
+    const app = createApp();
+    await new Promise((resolve) => {
+      server = app.listen(0, '127.0.0.1', () => {
+        port = server.address().port;
+        resolve();
+      });
+    });
+  });
+
+  after(async () => {
+    await new Promise((r) => server.close(r));
+    ctx.cleanup();
+  });
+
+  it('stores encrypted blob, hides it from other tenants, shares via token', async () => {
+    const created = await call(port, 'POST', '/zapier/v1/objects', ownerKey, {
+      filename: 'secret.txt',
+      contentBase64: Buffer.from('top-secret').toString('base64'),
+      publicMetadata: { title: 'pub' },
+      privateMetadata: { ssn: '000' },
+    });
+    assert.equal(created.status, 201);
+    const id = created.body.id;
+
+    const mine = await call(port, 'GET', `/zapier/v1/objects/${id}`, ownerKey);
+    assert.equal(mine.status, 200);
+    assert.equal(Buffer.from(mine.body.contentBase64, 'base64').toString(), 'top-secret');
+    assert.equal(mine.body.privateMetadata.ssn, '000');
+
+    const theirs = await call(port, 'GET', `/zapier/v1/objects/${id}`, otherKey);
+    assert.equal(theirs.status, 403);
+
+    const share = await call(port, 'POST', `/zapier/v1/objects/${id}/share`, ownerKey, { label: 'for-other' });
+    assert.equal(share.status, 201);
+    const redeemed = await call(port, 'GET', `/zapier/v1/shares/${share.body.token}`, otherKey);
+    assert.equal(redeemed.status, 200);
+    assert.equal(redeemed.body.filename, 'secret.txt');
+    assert.ok(redeemed.body.dek);
+    assert.equal(redeemed.body.publicMetadata.title, 'pub');
+  });
+
+  it('shares a directory tree of encrypted files', async () => {
+    const tree = await call(port, 'POST', '/zapier/v1/objects/trees', ownerKey, {
+      prefix: 'docs/',
+      files: [
+        { path: 'docs/a.txt', data: 'alpha' },
+        { path: 'docs/b.txt', data: 'beta' },
+      ],
+    });
+    assert.equal(tree.status, 201);
+    assert.equal(tree.body.fileCount, 2);
+    const share = await call(port, 'POST', `/zapier/v1/objects/trees/${tree.body.id}/share`, ownerKey, {});
+    assert.equal(share.status, 201);
+    assert.equal(share.body.kind, 'tree');
+    const redeemed = await call(port, 'GET', `/zapier/v1/shares/${share.body.token}`, otherKey);
+    assert.equal(redeemed.status, 200);
+    assert.equal(redeemed.body.kind, 'tree');
+    assert.equal(redeemed.body.files.length, 2);
+    assert.ok(redeemed.body.files[0].dek);
+  });
+
+  it('hash lookup never includes privateMetadata', async () => {
+    const created = await call(port, 'POST', '/zapier/v1/timestamp', ownerKey, {
+      data: 'meta-private',
+      publicMetadata: { vis: 'yes' },
+      privateMetadata: { secret: 'nope' },
+    });
+    const sha = created.body.sha256;
+    const look = await call(port, 'GET', `/zapier/v1/hashes/${sha}`, ownerKey);
+    assert.equal(look.status, 200);
+    assert.equal(look.body.publicMetadata.vis, 'yes');
+    assert.equal(look.body.privateMetadata, undefined);
+    const st = await call(port, 'GET', `/zapier/v1/status/${created.body.jobId}`, ownerKey);
+    assert.equal(st.body.privateMetadata.secret, 'nope');
+  });
+
+  it('returns a PDF receipt starting with %PDF', async () => {
+    const wait = await call(port, 'POST', '/zapier/v1/timestamp/wait', ownerKey, { data: 'pdf-receipt' });
+    const jobId = wait.body.id;
+    const rec = await raw(port, 'GET', `/zapier/v1/receipts/${jobId}?format=pdf`, ownerKey);
+    assert.equal(rec.status, 200);
+    assert.match(rec.body.toString('latin1').slice(0, 5), /%PDF-/);
+  });
+});
+
+function call(port, method, path, apiKey, body) {
+  return new Promise((resolve, reject) => {
+    const req = http.request(
+      {
+        hostname: '127.0.0.1',
+        port,
+        path,
+        method,
+        headers: { authorization: `Bearer ${apiKey}`, 'content-type': 'application/json' },
+      },
+      (res) => {
+        const chunks = [];
+        res.on('data', (c) => chunks.push(c));
+        res.on('end', () => {
+          const buf = Buffer.concat(chunks);
+          let parsed = {};
+          try {
+            parsed = buf.length ? JSON.parse(buf.toString()) : {};
+          } catch {
+            parsed = { raw: buf.toString() };
+          }
+          resolve({ status: res.statusCode, body: parsed });
+        });
+      },
+    );
+    req.on('error', reject);
+    if (body) req.write(JSON.stringify(body));
+    req.end();
+  });
+}
+
+function raw(port, method, path, apiKey) {
+  return new Promise((resolve, reject) => {
+    const req = http.request(
+      {
+        hostname: '127.0.0.1',
+        port,
+        path,
+        method,
+        headers: { authorization: `Bearer ${apiKey}` },
+      },
+      (res) => {
+        const chunks = [];
+        res.on('data', (c) => chunks.push(c));
+        res.on('end', () => resolve({ status: res.statusCode, body: Buffer.concat(chunks) }));
+      },
+    );
+    req.on('error', reject);
+    req.end();
+  });
+}
--- a/test/integration/receipt.test.js
+++ b/test/integration/receipt.test.js
@ -0,0 +1,72 @@
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert/strict';
+import http from 'node:http';
+import { createApp } from '../../src/app.js';
+import { useTempStore, seedProTenant } from '../helpers.js';
+import { clearMockJobs } from '../../src/clients/veraeClient.js';
+import { config } from '../../src/config.js';
+
+describe('retrieval receipt JSON', () => {
+  let ctx;
+  let server;
+  let port;
+  let apiKey;
+
+  before(async () => {
+    config.mockVerae = true;
+    config.natsEnabled = false;
+    config.mockJobCompleteMs = 50;
+    clearMockJobs();
+    ctx = useTempStore();
+    apiKey = seedProTenant().apiKey;
+    const app = createApp();
+    await new Promise((resolve) => {
+      server = app.listen(0, '127.0.0.1', () => {
+        port = server.address().port;
+        resolve();
+      });
+    });
+  });
+
+  after(async () => {
+    await new Promise((r) => server.close(r));
+    ctx.cleanup();
+  });
+
+  it('issues a JSON extra-seal receipt for a completed job', async () => {
+    const created = await call(port, 'POST', '/zapier/v1/timestamp/wait', apiKey, { data: 'receipt-me' });
+    assert.equal(created.body.status, 'completed');
+    const jobId = created.body.id;
+    const rec = await call(port, 'GET', `/zapier/v1/receipts/${jobId}?format=json`, apiKey);
+    assert.equal(rec.status, 200);
+    assert.equal(rec.body.type, 'verae.retrieval-receipt');
+    assert.equal(rec.body.extraSeal.event, 'document.retrieved');
+    assert.equal(rec.body.jobId, jobId);
+  });
+});
+
+function call(port, method, path, apiKey, body) {
+  return new Promise((resolve, reject) => {
+    const req = http.request(
+      {
+        hostname: '127.0.0.1',
+        port,
+        path,
+        method,
+        headers: { authorization: `Bearer ${apiKey}`, 'content-type': 'application/json' },
+      },
+      (res) => {
+        let data = '';
+        res.on('data', (c) => {
+          data += c;
+        });
+        res.on('end', () => {
+          resolve({ status: res.statusCode, body: data ? JSON.parse(data) : {} });
+        });
+      },
+    );
+    req.on('error', reject);
+    if (body) req.write(JSON.stringify(body));
+    req.end();
+  });
+}
--- a/test/integration/tenants.test.js
+++ b/test/integration/tenants.test.js
@ -0,0 +1,93 @@
+/**
+ * GATE 10 — Signup and admin provision
+ */
+
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert/strict';
+import { createApp } from '../../src/app.js';
+import { useTempStore } from '../helpers.js';
+import { config } from '../../src/config.js';
+
+describe('tenancy', () => {
+  let ctx;
+  let server;
+  let port;
+
+  before(async () => {
+    ctx = useTempStore();
+    const app = createApp({ load: false });
+    await new Promise((resolve) => {
+      server = app.listen(0, '127.0.0.1', () => {
+        port = server.address().port;
+        resolve();
+      });
+    });
+  });
+
+  after(async () => {
+    await new Promise((r) => server.close(r));
+    ctx.cleanup();
+  });
+
+  it('POST /zapier/v1/signup returns free plan + apiKey', async () => {
+    const res = await fetch(`http://127.0.0.1:${port}/zapier/v1/signup`, {
+      method: 'POST',
+      headers: { 'content-type': 'application/json' },
+      body: JSON.stringify({
+        email: 'user@example.com',
+        name: 'Self Serve Co',
+        veraeUsername: 'selfuser',
+        veraePassword: 'selfpass',
+      }),
+    });
+    assert.equal(res.status, 201);
+    const body = await res.json();
+    assert.equal(body.tenant.plan, 'free');
+    assert.ok(body.apiKey.startsWith('zmw_'));
+  });
+
+  it('enterprise without contract rejected', async () => {
+    const res = await fetch(`http://127.0.0.1:${port}/zapier/v1/admin/tenants`, {
+      method: 'POST',
+      headers: {
+        'content-type': 'application/json',
+        'x-admin-secret': config.adminSecret,
+      },
+      body: JSON.stringify({
+        name: 'Ent Co',
+        plan: 'enterprise',
+        veraeUsername: 'e',
+        veraePassword: 'p',
+      }),
+    });
+    assert.equal(res.status, 400);
+    const body = await res.json();
+    assert.equal(body.code, 'VALIDATION_ERROR');
+  });
+
+  it('admin list does not leak passwords', async () => {
+    const create = await fetch(`http://127.0.0.1:${port}/zapier/v1/admin/tenants`, {
+      method: 'POST',
+      headers: {
+        'content-type': 'application/json',
+        'x-admin-secret': config.adminSecret,
+      },
+      body: JSON.stringify({
+        name: 'Pro Co',
+        plan: 'pro',
+        veraeUsername: 'puser',
+        veraePassword: 'ppass',
+      }),
+    });
+    assert.equal(create.status, 201);
+
+    const res = await fetch(`http://127.0.0.1:${port}/zapier/v1/admin/tenants`, {
+      headers: { 'x-admin-secret': config.adminSecret },
+    });
+    assert.equal(res.status, 200);
+    const body = await res.json();
+    const json = JSON.stringify(body);
+    assert.doesNotMatch(json, /ppass/);
+    assert.doesNotMatch(json, /veraePassword/);
+  });
+});
--- a/test/integration/wait-nats.test.js
+++ b/test/integration/wait-nats.test.js
@ -0,0 +1,67 @@
+/**
+ * GATE 9 — /timestamp/wait via NATS events (timeout returns pending + jobId)
+ */
+
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert/strict';
+import { config } from '../../src/config.js';
+import { useTempStore, seedProTenant } from '../helpers.js';
+import { connectNats, ensureStreams, closeNats } from '../../src/nats/connection.js';
+import { startJobPollerWorker, stopJobPollerWorker } from '../../src/workers/jobPollerWorker.js';
+import { createTimestampAndWait } from '../../src/services/timestampService.js';
+import { resolveAuthContext } from '../../src/services/authService.js';
+import { clearMockJobs } from '../../src/clients/veraeClient.js';
+
+describe('GATE 9 wait via NATS', () => {
+  /** @type {ReturnType<typeof useTempStore>} */
+  let ctx;
+  let authCtx;
+
+  before(async () => {
+    assert.equal(config.mockVerae, true);
+    config.natsEnabled = true;
+    process.env.NATS_FORCE_CONNECT = '1';
+    config.natsUrl = process.env.NATS_URL || 'nats://127.0.0.1:4222';
+    config.jobPollIntervalMs = 40;
+    config.jobPollMaxAttempts = 40;
+    config.waitTimeoutMs = 8000;
+    config.mockJobCompleteMs = 80;
+
+    clearMockJobs();
+    ctx = useTempStore();
+    const seeded = seedProTenant();
+    authCtx = await resolveAuthContext(seeded.apiKey);
+
+    await connectNats(config.natsUrl);
+    await ensureStreams();
+    await startJobPollerWorker();
+  });
+
+  after(async () => {
+    await stopJobPollerWorker();
+    await closeNats();
+    ctx.cleanup();
+    process.env.NATS_FORCE_CONNECT = '';
+  });
+
+  it('wait returns completed when worker finishes before timeout', async () => {
+    const status = await createTimestampAndWait(authCtx, { data: 'wait-fast' });
+    assert.equal(status.status, 'completed');
+    assert.ok(status.id || status.jobId);
+  });
+
+  it('wait returns pending + jobId on timeout', async () => {
+    const prevWait = config.waitTimeoutMs;
+    const prevDelay = config.mockJobCompleteMs;
+    config.waitTimeoutMs = 60;
+    config.mockJobCompleteMs = 30_000;
+    try {
+      const status = await createTimestampAndWait(authCtx, { data: 'wait-slow' });
+      assert.equal(status.status, 'pending');
+      assert.ok(status.jobId || status.id);
+    } finally {
+      config.waitTimeoutMs = prevWait;
+      config.mockJobCompleteMs = prevDelay;
+    }
+  });
+});
--- a/test/unit/app.test.js
+++ b/test/unit/app.test.js
@ -0,0 +1,49 @@
+/**
+ * GATE 2 (partial) — HTTP shell health endpoint.
+ */
+
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert/strict';
+import { createApp } from '../../src/app.js';
+
+describe('createApp', () => {
+  /** @type {import('http').Server} */
+  let server;
+  /** @type {number} */
+  let port;
+
+  before(async () => {
+    const app = createApp();
+    await new Promise((resolve) => {
+      server = app.listen(0, '127.0.0.1', resolve);
+    });
+    port = server.address().port;
+  });
+
+  after(async () => {
+    await new Promise((resolve) => server.close(resolve));
+  });
+
+  it('GET /health returns ok', async () => {
+    const res = await fetch(`http://127.0.0.1:${port}/health`);
+    assert.equal(res.status, 200);
+    const body = await res.json();
+    assert.equal(body.status, 'ok');
+    assert.equal(body.service, 'verae-zapier-middleware');
+    assert.equal(typeof body.mockVerae, 'boolean');
+    assert.equal(typeof body.natsEnabled, 'boolean');
+    assert.equal(typeof body.natsConnected, 'boolean');
+    assert.ok(res.headers.get('x-trace-id'));
+  });
+
+  it('protected /zapier path requires auth', async () => {
+    const res = await fetch(`http://127.0.0.1:${port}/zapier/v1/timestamp`, {
+      method: 'POST',
+      headers: { 'content-type': 'application/json' },
+      body: '{}',
+    });
+    assert.equal(res.status, 401);
+    const body = await res.json();
+    assert.equal(body.code, 'UNAUTHORIZED');
+  });
+});
--- a/test/unit/config.test.js
+++ b/test/unit/config.test.js
@ -0,0 +1,34 @@
+/**
+ * GATE 2 (partial) — config exports.
+ */
+
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { config, PLAN_LIMITS } from '../../src/config.js';
+
+describe('config', () => {
+  it('exposes required keys for HTTP and NATS', () => {
+    for (const key of [
+      'port',
+      'host',
+      'veraeApiBaseUrl',
+      'mockVerae',
+      'natsEnabled',
+      'natsUrl',
+      'tokenSecret',
+      'jobPollIntervalMs',
+      'jobPollMaxAttempts',
+      'waitTimeoutMs',
+      'storePath',
+    ]) {
+      assert.notEqual(config[key], undefined, `missing config.${key}`);
+    }
+  });
+
+  it('defines plan limits for free through enterprise', () => {
+    for (const plan of ['free', 'starter', 'pro', 'enterprise']) {
+      assert.ok(PLAN_LIMITS[plan], plan);
+      assert.equal(typeof PLAN_LIMITS[plan].requestsPerMinute, 'number');
+    }
+  });
+});
--- a/test/unit/debug.test.js
+++ b/test/unit/debug.test.js
@ -0,0 +1,165 @@
+/**
+ * GATE 1 — Debug facility unit tests.
+ * Must pass before Phase 2.
+ */
+
+import { describe, it, beforeEach, afterEach } from 'node:test';
+import assert from 'node:assert/strict';
+
+import {
+  parseDebugVeraeEnv,
+  loadDebugConfig,
+  shouldLog,
+  createDebugger,
+  setDebugTestSink,
+  redact,
+  withTrace,
+  getTraceId,
+  generateTraceId,
+} from '../../src/debug/index.js';
+
+describe('parseDebugVeraeEnv', () => {
+  it('disables when unset or empty', () => {
+    assert.equal(parseDebugVeraeEnv(undefined).enabled, false);
+    assert.equal(parseDebugVeraeEnv('').enabled, false);
+    assert.equal(parseDebugVeraeEnv('off').enabled, false);
+  });
+
+  it('enables all namespaces for 1 or *', () => {
+    const a = parseDebugVeraeEnv('1');
+    assert.equal(a.enabled, true);
+    assert.equal(a.namespaces, null);
+
+    const b = parseDebugVeraeEnv('*');
+    assert.equal(b.enabled, true);
+    assert.equal(b.namespaces, null);
+  });
+
+  it('parses comma-separated namespaces', () => {
+    const { enabled, namespaces } = parseDebugVeraeEnv('auth, NATS, jobs');
+    assert.equal(enabled, true);
+    assert.ok(namespaces.has('auth'));
+    assert.ok(namespaces.has('nats'));
+    assert.ok(namespaces.has('jobs'));
+    assert.equal(namespaces.has('webhooks'), false);
+  });
+});
+
+describe('shouldLog', () => {
+  it('respects level thresholds', () => {
+    const config = {
+      enabled: true,
+      namespaces: null,
+      level: 'warn',
+      filePath: null,
+    };
+    assert.equal(shouldLog(config, 'app', 'debug'), false);
+    assert.equal(shouldLog(config, 'app', 'warn'), true);
+    assert.equal(shouldLog(config, 'app', 'error'), true);
+  });
+
+  it('filters by namespace', () => {
+    const config = {
+      enabled: true,
+      namespaces: new Set(['auth']),
+      level: 'debug',
+      filePath: null,
+    };
+    assert.equal(shouldLog(config, 'auth', 'debug'), true);
+    assert.equal(shouldLog(config, 'nats', 'debug'), false);
+  });
+});
+
+describe('redact', () => {
+  it('redacts sensitive keys and token-like strings', () => {
+    const out = redact({
+      password: 'secret',
+      apiKey: 'zmw_abc123def456ghi789jkl',
+      jobId: 'keep-me',
+      authorization: 'Bearer eyJhbGciOiJIUzI1NiJ9.aaa.bbb',
+      nested: { veraeToken: 'zmt_payload.sig' },
+    });
+
+    assert.equal(out.password, '[REDACTED]');
+    assert.equal(out.apiKey, '[REDACTED]');
+    assert.equal(out.jobId, 'keep-me');
+    assert.equal(out.authorization, '[REDACTED]');
+    assert.equal(out.nested.veraeToken, '[REDACTED]');
+  });
+});
+
+describe('createDebugger', () => {
+  /** @type {string[]} */
+  let lines;
+  const prev = { ...process.env };
+
+  beforeEach(() => {
+    lines = [];
+    setDebugTestSink((line) => lines.push(line));
+  });
+
+  afterEach(() => {
+    setDebugTestSink(null);
+    for (const key of Object.keys(process.env)) {
+      if (!(key in prev)) delete process.env[key];
+    }
+    Object.assign(process.env, prev);
+  });
+
+  it('is silent when DEBUG_VERAE is unset', () => {
+    delete process.env.DEBUG_VERAE;
+    const log = createDebugger('auth');
+    log.debug('should not appear', { x: 1 });
+    assert.equal(lines.length, 0);
+  });
+
+  it('emits only selected namespaces', () => {
+    process.env.DEBUG_VERAE = 'auth';
+    createDebugger('auth').debug('auth-line');
+    createDebugger('nats').debug('nats-line');
+    assert.equal(lines.length, 1);
+    assert.match(lines[0], /auth-line/);
+    assert.doesNotMatch(lines[0], /nats-line/);
+  });
+
+  it('redacts secrets in meta', () => {
+    process.env.DEBUG_VERAE = 'auth';
+    createDebugger('auth').debug('login', {
+      password: 'hunter2',
+      token: 'zmw_supersecretvaluehere12',
+    });
+    assert.equal(lines.length, 1);
+    assert.doesNotMatch(lines[0], /hunter2/);
+    assert.doesNotMatch(lines[0], /zmw_supersecret/);
+    assert.match(lines[0], /REDACTED/);
+  });
+});
+
+describe('withTrace', () => {
+  it('propagates traceId to nested async work', async () => {
+    const outerId = generateTraceId();
+    let innerId = null;
+
+    await withTrace({ traceId: outerId, span: 'outer' }, async () => {
+      assert.equal(getTraceId(), outerId);
+      await withTrace({ span: 'inner' }, async () => {
+        innerId = getTraceId();
+      });
+    });
+
+    assert.equal(innerId, outerId);
+    assert.equal(getTraceId(), null);
+  });
+});
+
+describe('loadDebugConfig', () => {
+  it('reads level and file from env', () => {
+    process.env.DEBUG_VERAE = '1';
+    process.env.DEBUG_VERAE_LEVEL = 'error';
+    process.env.DEBUG_VERAE_FILE = '/tmp/verae-debug.log';
+    const cfg = loadDebugConfig(process.env);
+    assert.equal(cfg.enabled, true);
+    assert.equal(cfg.level, 'error');
+    assert.equal(cfg.filePath, '/tmp/verae-debug.log');
+  });
+});
--- a/test/unit/store.test.js
+++ b/test/unit/store.test.js
@ -0,0 +1,105 @@
+/**
+ * GATE 3 — Store unit tests
+ */
+
+import { describe, it, beforeEach, afterEach } from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  useTempStore,
+  seedFreeTenant,
+  seedEnterpriseTenant,
+} from '../helpers.js';
+import { getTenantByApiKey, resolveLimits, getTenant } from '../../src/store/tenants.js';
+import {
+  createWebhook,
+  getActiveWebhooks,
+  listWebhooksForTenant,
+  deleteWebhook,
+} from '../../src/store/webhooks.js';
+import { getUsage, incrementUsage } from '../../src/store/usage.js';
+import { reloadStore, getStore } from '../../src/store/db.js';
+
+describe('stores', () => {
+  /** @type {ReturnType<typeof useTempStore>} */
+  let ctx;
+
+  beforeEach(() => {
+    ctx = useTempStore();
+  });
+
+  afterEach(() => {
+    ctx.cleanup();
+  });
+
+  it('create tenant → API key resolves to same tenant', () => {
+    const { tenant, apiKey } = seedFreeTenant();
+    const found = getTenantByApiKey(apiKey);
+    assert.ok(found);
+    assert.equal(found.id, tenant.id);
+    assert.equal(found.plan, 'free');
+  });
+
+  it('free plan limits applied; enterprise contract overrides', () => {
+    const { tenant: free } = seedFreeTenant();
+    const freeLimits = resolveLimits(free);
+    assert.equal(freeLimits.timestamps, 50);
+    assert.equal(freeLimits.batch, false);
+
+    const { tenant: ent } = seedEnterpriseTenant();
+    const entLimits = resolveLimits(ent);
+    assert.equal(entLimits.timestamps, 10);
+    assert.equal(entLimits.batch, true);
+    assert.equal(entLimits.batchMaxItems, 5);
+  });
+
+  it('webhook isolation per tenant', () => {
+    seedFreeTenant({ id: 'a' });
+    seedFreeTenant({ id: 'b', veraeUsername: 'u2' });
+
+    createWebhook({
+      tenantId: 'a',
+      targetUrl: 'https://hooks.example/a',
+      event: 'timestamp.completed',
+    });
+    createWebhook({
+      tenantId: 'b',
+      targetUrl: 'https://hooks.example/b',
+      event: 'timestamp.completed',
+    });
+
+    const aHooks = listWebhooksForTenant('a');
+    const bHooks = getActiveWebhooks('b', 'timestamp.completed');
+    assert.equal(aHooks.length, 1);
+    assert.equal(aHooks[0].targetUrl, 'https://hooks.example/a');
+    assert.equal(bHooks.length, 1);
+    assert.equal(bHooks[0].tenantId, 'b');
+  });
+
+  it('persist + reload round-trip preserves data', () => {
+    const { tenant, apiKey } = seedFreeTenant({ id: 'persist-me' });
+    incrementUsage(tenant.id, 'timestamps', 3);
+    createWebhook({
+      tenantId: tenant.id,
+      targetUrl: 'https://hooks.example/x',
+      event: 'timestamp.completed',
+    });
+
+    reloadStore(ctx.storePath);
+
+    assert.equal(getTenant('persist-me')?.name, tenant.name);
+    assert.equal(getTenantByApiKey(apiKey)?.id, 'persist-me');
+    assert.equal(getUsage('persist-me').timestamps, 3);
+    assert.equal(getStore().webhooks.length, 1);
+  });
+
+  it('deleteWebhook removes by id', () => {
+    seedFreeTenant({ id: 'w' });
+    const hook = createWebhook({
+      tenantId: 'w',
+      targetUrl: 'https://hooks.example/w',
+      event: 'timestamp.completed',
+    });
+    assert.equal(deleteWebhook({ tenantId: 'w', hookId: hook.id }), true);
+    assert.equal(listWebhooksForTenant('w').length, 0);
+  });
+});
--- a/test/unit/tokens.test.js
+++ b/test/unit/tokens.test.js
@ -0,0 +1,55 @@
+/**
+ * GATE 4 — Token tests
+ */
+
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  issueSessionToken,
+  parseSessionToken,
+  generateApiKey,
+  isApiKey,
+  extractBearerToken,
+} from '../../src/lib/tokens.js';
+import { config } from '../../src/config.js';
+
+describe('tokens', () => {
+  it('issues and parses session tokens', () => {
+    const token = issueSessionToken({
+      tenantId: 't1',
+      veraeToken: 'mock-jwt-user',
+      expiresAt: '2099-01-01T00:00:00Z',
+    });
+    assert.ok(token.startsWith('zmt_'));
+    const parsed = parseSessionToken(token);
+    assert.equal(parsed.tenantId, 't1');
+    assert.equal(parsed.veraeToken, 'mock-jwt-user');
+  });
+
+  it('rejects forged session tokens', () => {
+    const token = issueSessionToken({
+      tenantId: 't1',
+      veraeToken: 'secret',
+    });
+    const forged = token.slice(0, -4) + 'xxxx';
+    assert.equal(parseSessionToken(forged), null);
+  });
+
+  it('rejects tokens signed with wrong secret', () => {
+    const token = issueSessionToken({
+      tenantId: 't1',
+      veraeToken: 'secret',
+    });
+    const original = config.tokenSecret;
+    config.tokenSecret = 'other-secret';
+    assert.equal(parseSessionToken(token), null);
+    config.tokenSecret = original;
+  });
+
+  it('generates api keys and extracts bearer', () => {
+    const key = generateApiKey();
+    assert.ok(isApiKey(key));
+    assert.equal(extractBearerToken(`Bearer ${key}`), key);
+    assert.equal(extractBearerToken(undefined), null);
+  });
+});
--- a/test/unit/veraeClient.test.js
+++ b/test/unit/veraeClient.test.js
@ -0,0 +1,64 @@
+/**
+ * GATE 4 — Mock Verae client lifecycle
+ */
+
+import { describe, it, beforeEach } from 'node:test';
+import assert from 'node:assert/strict';
+import { veraeClient, clearMockJobs } from '../../src/clients/veraeClient.js';
+import { config } from '../../src/config.js';
+import { setDebugTestSink, createDebugger } from '../../src/debug/index.js';
+
+describe('veraeClient mock', () => {
+  beforeEach(() => {
+    clearMockJobs();
+    // ensure mock mode (set at process start via env in gate script)
+    assert.equal(config.mockVerae, true, 'MOCK_VERAE must be true for unit tests');
+  });
+
+  it('create → wait → completed', async () => {
+    const login = await veraeClient.login({ username: 'u', password: 'p' });
+    assert.ok(login.token.startsWith('mock-jwt-'));
+
+    const { jobId } = await veraeClient.createTimestamp(login.token, {
+      data: 'hello',
+      hashAlg: 'SHA256',
+    });
+    assert.ok(jobId);
+
+    const status = await veraeClient.waitForJob(login.token, jobId, {
+      maxAttempts: 40,
+      intervalMs: 20,
+    });
+    assert.equal(status.status, 'completed');
+    assert.ok(status.result.startsWith('mock-cert-'));
+  });
+
+  it('verify accepts mock certificates', async () => {
+    const login = await veraeClient.login({ username: 'u', password: 'p' });
+    const { jobId } = await veraeClient.createTimestamp(login.token, { data: 'x' });
+    const status = await veraeClient.waitForJob(login.token, jobId, {
+      maxAttempts: 40,
+      intervalMs: 20,
+    });
+    const result = await veraeClient.verify(login.token, { certificate: status.result });
+    assert.equal(result.valid, true);
+  });
+
+  it('debug http logs do not include Authorization values', () => {
+    const lines = [];
+    setDebugTestSink((line) => lines.push(line));
+    process.env.DEBUG_VERAE = 'http';
+    const log = createDebugger('http');
+    log.debug('verae request', {
+      method: 'POST',
+      path: '/api/timestamp',
+      authorization: 'Bearer super-secret-token-value',
+      hasToken: true,
+    });
+    setDebugTestSink(null);
+    delete process.env.DEBUG_VERAE;
+    assert.equal(lines.length, 1);
+    assert.doesNotMatch(lines[0], /super-secret-token-value/);
+    assert.match(lines[0], /REDACTED|hasToken/);
+  });
+});