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# Zappier — Operations & Usage Manual
**Version:** 0.2.0 · **Last updated:** 2026-07-28
Zappier is a metered API platform: every API call your customers make is priced
per endpoint, adjusted by their customer type, tracked in a usage ledger, and
billed through Stripe once a day — or invoiced manually by purchase order.
Customers self-serve through the portal at `/portal`. This manual covers
running and operating the system. For internals, see
[DEVELOPER.md](DEVELOPER.md); for accounting procedures see
[ACCOUNTING.md](ACCOUNTING.md); for the end-user view see
[CUSTOMER-PORTAL.md](CUSTOMER-PORTAL.md).
---
## Table of contents
1. [Quick start](#1-quick-start)
2. [The three surfaces](#2-the-three-surfaces)
3. [How pricing works](#3-how-pricing-works)
4. [Operating the Pricing Admin UI](#4-operating-the-pricing-admin-ui)
5. [Using the public API](#5-using-the-public-api)
6. [Billing operations (Stripe)](#6-billing-operations-stripe)
7. [The Zapier integration](#7-the-zapier-integration)
8. [Day-to-day runbook](#8-day-to-day-runbook)
9. [Troubleshooting](#9-troubleshooting)
---
## 1. Quick start
```bash
cd /Users/marchon/zappier
npm install
npm run dev # starts the API on http://localhost:3000
```
Environment variables (all optional except `STRIPE_SECRET_KEY` for billing):
| Variable | Default | Purpose |
|---|---|---|
| `PORT` | `3000` | HTTP port for the API server |
| `ZAPPIER_DB` | `<install root>/zappier.db` | SQLite database file location |
| `ADMIN_KEY` | `admin-dev-key` | Key for the admin console and admin API |
| `ADMIN_USER` | `admin` | Admin console primary username |
| `DEMO_ADMIN_USER` / `DEMO_ADMIN_PASSWORD` | `demo` / `$$$Adm1n###` | Demo sign-in — override in production |
| `STRIPE_SECRET_KEY` | — (required for billing) | Billing job + portal reloads, loaded from `.env` |
All runtime paths (database default, `.env`, OpenAPI spec, static assets)
resolve from the installation root — the compiled server (`node
dist/index.js`) runs from any working directory, under systemd, Docker, or cron.
The `.env` file at the repo root holds `STRIPE_SECRET_KEY`. It is gitignored
and owner-only (`chmod 600`). A template is in `.env.example`.
On first start the database is created and seeded with:
- **Rate card:** `status` (free), `storage-list` (free), `transform` (fixed 4¢),
`storage` (variable: 10¢ base + 1¢/KB metadata + 50¢/MB attachments)
- **Customer types:** Free (×1.0, 100¢/month credit), Pro (×0.5, 1000¢ credit),
Business (×0.25, 10000¢ credit)
- **Demo customers:** `key-ada` (Free), `key-grace` (Pro), `key-linus` (Business)
> Seeding only happens into an **empty** database. Existing data is never
> overwritten on restart.
---
## 2. The three surfaces
| Surface | URL / location | Who it's for |
|---|---|---|
| **Public API** | `http://localhost:3000/v1/*` | Your API customers |
| **Interactive API docs** | `http://localhost:3000/docs` | Developers integrating with you |
| **Admin console** | `http://localhost:3000/admin` | You (operations & accounting) |
| **Customer portal** | `http://localhost:3000/portal` | End-user customers (self-service) |
| **Zapier app** | `zapier-app/` directory | No-code users via Zapier |
![Interactive API docs](screenshots/api-docs.png)
---
## 3. How pricing works
Every priced call returns its **quote** in the response, so customers always
know what a call cost:
```json
{
"quote": {
"endpointId": "storage",
"listCents": 62,
"totalCents": 31,
"breakdown": { "baseCents": 10, "metadataCents": 2, "attachmentCents": 50 }
}
}
```
The price of a call is computed in three steps:
1. **Endpoint rule** (from the rate card):
- `free` — always 0¢
- `fixed` — a flat `fixedCents` per call
- `variable` — `baseCents` + `perKbCents` × ceil(metadata bytes / 1024)
+ `perMbCents` × ceil(attachment bytes / 1 MB)
2. **Customer-type multiplier** — `totalCents = round(listCents × multiplier)`.
A per-customer **multiplier override** (set in the Customers tab) wins over
the type multiplier — use it for negotiated enterprise deals.
3. **Monthly credit** — at billing time, each customer's type credit
(e.g. Pro = 1000¢) is subtracted from their month-to-date total. Only the
excess is billed.
**Worked example.** A Pro customer (×0.5) uploads a 1 MB file with 2 KB of
metadata to `storage`:
- list = 10¢ base + 2¢ metadata + 50¢ attachment = **62¢**
- Pro multiplier: 62 × 0.5 = **31¢** charged to their usage ledger
- If their month-to-date is 1500¢ and the Pro credit is 1000¢, the daily
billing job reports **500¢** to Stripe.
---
## 4. Operating the Pricing Admin UI
Open `http://localhost:3000/admin` and sign in. Two accounts are available:
| Username | Password | Purpose |
|---|---|---|
| `admin` | the `ADMIN_KEY` env value (default `admin-dev-key`) | Primary operator |
| `demo` | `$$$Adm1n###` (env `DEMO_ADMIN_PASSWORD`) | Demo / stakeholder access |
Sessions are token-based and remembered in browser local storage until you
click **Sign out** or the server restarts (tokens are in-memory — just sign in
again). The legacy `x-admin-key` header still works for scripts and curl.
### 4.1 Rate card tab
![Rate card](screenshots/admin-rate-card.png)
One row per API endpoint (matched by OpenAPI `operationId`).
- **Change a price:** edit the kind (`free` / `fixed` / `variable`) and the
cent fields, then click **Save**. Takes effect on the next API call — no
restart needed.
- **Add an endpoint:** enter the `operationId` (must match `openapi.yaml`),
pick a kind, click **Add**.
- **Delete** removes the rule. If an endpoint has no rule and the customer's
type has no default rule, calls to it are rejected with 403 — deletion is
how you turn an endpoint **off**.
### 4.2 Customer types tab
![Customer types](screenshots/admin-tiers.png)
Types are your pricing tiers.
- **Multiplier** scales every price for that type (0.5 = 50% of list).
- **Monthly credit (cents)** is the free included usage per month.
- **Add customer type:** id, name, multiplier. New types start with 0 credit;
edit after adding.
### 4.3 Customers tab
![Customers](screenshots/admin-customers.png)
- **Create** a customer: name + type. **The API key is shown once** in the
status line at the bottom — copy it immediately and send it to the customer.
- **Change type** with the dropdown, then **Save**.
- **Email** — used for portal sign-in/claiming and email invoicing.
- **Billing** — `Stripe` (metered by the daily job) or `Purchase order`
(manual invoicing with PO numbers; see [ACCOUNTING.md](ACCOUNTING.md)).
- **Multiplier override**: a number here replaces the type multiplier for this
customer only. Leave blank to inherit from the type.
- Stripe customer IDs are attached via the admin API
(`PUT /admin/api/customers/:id` with `{"stripeCustomerId": "cus_..."}`) —
see section 6.
### 4.4 Invoices, Reports, System tabs
The **Invoices** tab generates monthly invoices from metered usage (per period,
optionally per customer, with optional PO number), walks them
draft → issued → paid, and opens print-ready invoice pages. The **Reports** tab
produces date-ranged billing reports (all customers, one customer, or one
billing type) with CSV download, plus daily/weekly usage-trend charts. The
**System** tab shows Zapier integration health and the current-period billing
snapshot. Full procedures: [ACCOUNTING.md](ACCOUNTING.md).
![Invoices](screenshots/admin-invoices.png)
---
## 4A. Customer portal
Your customers self-serve at `http://localhost:3000/portal`: signup (or
claiming an account you created, by email), sign-in with optional TOTP
two-factor authentication, month-to-date usage, invoice history with print
view, prepaid balance reloads (drawn down automatically at invoice issue),
email-invoicing preferences, API-key regeneration, and live pricing. The full
end-user guide is [CUSTOMER-PORTAL.md](CUSTOMER-PORTAL.md).
---
## 5. Using the public API
All calls need the customer's API key in the `x-api-key` header. Interactive
docs with a "Try it out" console are at `/docs`.
```bash
# Free status check
curl -H 'x-api-key: key-ada' http://localhost:3000/v1/status
# Fixed-price call (4¢ list)
curl -X POST -H 'x-api-key: key-grace' -H 'content-type: application/json' \
-d '{"text":"hello"}' http://localhost:3000/v1/transform
# Variable-price call: metadata + attachments
curl -X POST -H 'x-api-key: key-grace' \
-F 'metadata={"title":"Q3 report"}' \
-F 'attachments=@report.pdf' \
http://localhost:3000/v1/storage
# List your stored items (free)
curl -H 'x-api-key: key-grace' http://localhost:3000/v1/storage
# Your month-to-date usage, with credit applied
curl -H 'x-api-key: key-grace' http://localhost:3000/v1/usage
```
Limits & validation: requests are validated against `openapi.yaml` (bad
requests get 400); attachments are capped at **25 MB per file**; `metadata`
must be valid JSON (400 otherwise).
---
## 6. Billing operations (Stripe)
### 6.1 How it works
A scheduled job runs the billing reporter **daily at 06:17 America/New_York**
(Kimi cron job "Zappier billing · report usage to Stripe"). For each customer
with a Stripe ID it:
1. Sums their usage since the 1st of the month, subtracts their type's monthly
credit → **billable cents**.
2. Reports only the **delta** above what was already reported this month to
Stripe as a meter event (`zappier.api_cents`, value = cents).
3. Records the new cumulative total in the `billing_reports` ledger.
Re-running is always safe: the ledger makes repeats no-ops, a per-run lock
prevents overlapping executions, and a deterministic Stripe `identifier`
(`customer:period:billable`) dedupes crash retries.
### 6.2 One-time Stripe setup (test mode)
1. Dashboard (test mode ON) → **Billing → Meters → Create meter**:
event name `zappier.api_cents`, aggregation **Sum** of `value`,
customer mapping `stripe_customer_id`.
2. **Product catalog → Add product** "Zappier API usage" → price: recurring,
monthly, metered against that meter, **$0.01 per unit** (1 unit = 1 cent).
3. For each billable customer: create the Stripe Customer, attach a payment
method, and add a **subscription** with the metered price. Meter events for
customers without a metered subscription are recorded but never invoiced.
4. Put the `sk_test_...` key into `.env` (replace the placeholder).
5. Attach Stripe IDs to Zappier customers:
```bash
curl -X PUT -H 'x-admin-key: admin-dev-key' -H 'content-type: application/json' \
-d '{"stripeCustomerId":"cus_..."}' \
http://localhost:3000/admin/api/customers/cust_2
```
### 6.3 Verifying a run
```bash
npx ts-node src/jobs/report-usage.ts
```
Expected output per customer:
- `skip <id> <period> (nothing to report)` — no billable usage yet
- `skip <id> <period> (already reported Nc)` — no new usage since last run
- `<id>: reported N billable cents to Stripe` — delta sent
- `report-usage: another run holds the lock, abort run` — safe concurrent abort
Then check the meter's **Events** tab in the Stripe dashboard and the test
customer's **upcoming invoice**.
### 6.4 Going live
Repeat 6.2 steps 1–3 in live mode, replace `.env` with the `sk_live_...` key
from the **same Stripe account**, and keep the same cron. The live product
`prod_Uxv9SAeIOZzyx1` (currently deactivated) can be reactivated or recreated.
---
## 7. The Zapier integration
The `zapier-app/` directory contains the Zapier Platform app:
- **Authentication:** API key — the user pastes their API base URL
(e.g. `http://localhost:3000`) and their `key-...` customer key; the
connection is tested against `/v1/status`.
- **Trigger "New Item":** polls `GET /v1/storage` for newly stored items.
- **Action "Store Data":** calls `POST /v1/storage` with metadata and optional
file attachments — billed per the rate card.
To publish: create a Zapier developer account, `cd zapier-app && npm install
&& zapier login && zapier push`, then share the app or submit it to the Zapier
marketplace.
---
## 8. Day-to-day runbook
| Task | How |
|---|---|
| Change a price | Admin console → Rate card → Save |
| Add a customer | Admin console → Customers → Create → copy the one-time API key |
| Set a customer's billing type/email | Customers tab → Billing dropdown / Email field → Save |
| Invoice a period | Invoices tab → Generate → Issue → Mark paid (ACCOUNTING.md) |
| Export accounting data | Reports tab → filters → Download CSV |
| Give a customer a deal | Customers tab → multiplier override, or a new customer type |
| Turn an endpoint off | Rate card → Delete (calls get 403) |
| Check a customer's usage | Their portal dashboard, `GET /v1/usage` with their key, or query `zappier.db` |
| Check billing ran | Kimi notification after each 06:17 run; or run the job manually |
| Backup | Copy `zappier.db` (SQLite, single file) |
| Update dependencies | `npm outdated`, then `npm test` must stay green (165 tests) |
---
## 9. Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| `401 invalid or missing API key` | Wrong/absent `x-api-key` | Re-issue key from Customers tab |
| `403 No price rule for ...` | Endpoint deleted from rate card and tier has no default rule | Re-add the rule, or set a tier `defaultRule` |
| `403 Unknown tier` | Customer's `tierId` doesn't exist | Fix the customer's type in the admin UI |
| `400 invalid metadata JSON` | `metadata` form field isn't valid JSON | Send e.g. `{"key":"value"}` |
| `413 ... file too large` | Attachment over 25 MB | Split or compress the file |
| Billing run: Stripe auth error | Placeholder/wrong key in `.env`, or key from a different Stripe account | Use the `sk_test`/`sk_live` key from the account that holds the meter |
| Stripe shows `METER_NOT_FOUND` invalid events | Meter missing or event name mismatch | Meter event name must be exactly `zappier.api_cents` |
| `another run holds the lock, abort run` | Overlapping runs, or a crash left a stale lock | Safe by design; stale locks expire after 1 hour |
| Admin UI: "invalid username or password" | Wrong credentials, or env overrides changed them | Check `ADMIN_KEY` / `DEMO_ADMIN_PASSWORD`; sign in again |
| Admin UI: "Session expired" | Server restarted (admin tokens are in-memory) | Sign in again |
| Portal login: `totp_required` | 2FA is enabled on the account | Enter the current 6-digit authenticator code |
| Portal: "invalid or expired session" | 7-day session expired | Sign in again |
| Portal reload didn't credit | Real `STRIPE_SECRET_KEY` configured → PaymentIntent awaits confirmation | Balance credits when the payment confirms; in dev (placeholder key) credit is instant |
| Invoice went straight to `paid` on Issue | Customer's prepaid balance fully covered the amount due | Working as designed — balance was drawn down |