Milestone 0: import zappier billing, Verae middleware, and Zapier research

Compose-ready workspace: packages/zappier (rate card, portal, Stripe),
packages/verae-zapier-middleware (timestamp + NATS), packages/verae-zapier
(CLI app), vendor/zapier-platform, and research/zapier vendor corpus.

Gate 0 structure checks pass. Product code and research are not yet wired.

vendor/zapier-platform/packages/schema/lib/schemas/AuthenticationCustomConfigSchema.js

@@ -0,0 +1,37 @@
+'use strict';
+
+const makeSchema = require('../utils/makeSchema');
+const FunctionSchema = require('./FunctionSchema');
+const RequestSchema = require('./RequestSchema');
+
+module.exports = makeSchema(
+  {
+    id: '/AuthenticationCustomConfigSchema',
+    description:
+      'Config for custom authentication (like API keys). No extra properties are required to setup this auth type, so you can leave this empty if your app uses a custom auth method.',
+    type: 'object',
+    properties: {
+      sendCode: {
+        description:
+          'EXPERIMENTAL: Define the call Zapier should make to send the OTP code.',
+        oneOf: [{ $ref: RequestSchema.id }, { $ref: FunctionSchema.id }],
+      },
+    },
+    additionalProperties: false,
+    examples: [
+      {},
+      {
+        sendCode: {
+          url: 'https://example.com/api/send',
+          headers: { Authorization: `Bearer {{process.env.API_KEY}}` },
+          body: {
+            to_phone_number: '{{bundle.inputData.phone_number}}',
+            code: '{{bundle.inputData.code}}',
+          },
+        },
+      },
+    ],
+    antiExamples: [{ example: { foo: true }, reason: 'Invalid key.' }],
+  },
+  [RequestSchema, FunctionSchema],
+);