# `zappier/app`

**Package:** `zappier`  
**Source:** `packages/zappier/src/app.ts`  
**Lines:** 272

## What this module is

Implementation module in `zappier`. The tables below are extracted from the source (signatures + JSDoc).

## Exports

`StoredItem`, `DEFAULT_CUSTOMERS`, `AppDeps`, `buildApp`

## Types / interfaces / classes

| Kind | Name |
|------|------|
| interface | `StoredItem` |
| interface | `AppDeps` |

## Functions

| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
|------|------------|---------------------|---------|-----------------------------|
| `buildApp` | `deps: AppDeps = {}` | — | `unknown` | see Call graph |
| `onUsage` | `e: { customerId: string; endpointId: string; cents: number }` | — | `unknown` | see Call graph |

## What it imports / requires

- `path`
- `crypto`
- `express`
- `express-openapi-validator`
- `swagger-ui-express`
- `yamljs`
- `./auth`
- `./meter`
- `./billing/credit`
- `./pricing`
- `./usage`
- `./admin`
- `./admin-users`
- `./accounts`
- `./invoicing`
- `./paths`
- `./portal`
- `./upstream`
- `./credits`
- `./statement`
- `./billing-nats`

## Call graph (identifiers invoked)

`join`, `next`, `parse`, `status`, `json`, `buildApp`, `seeded`, `seedAdminUsersFromEnv`, `rateCard`, `getRateCard`, `tiers`, `getTiers`, `natsPublish`, `toISOString`, `express`, `use`, `load`, `setup`, `adminLoginRouter`, `adminAuth`, `adminRouter`, `static`, `async`, `import`, `toDataURL`, `portalRouter`, `get`, `apiKeyAuth`, `middleware`, `meter`, `post`, `toUpperCase`, `proxyVerae`, `toLowerCase`, `createHash`, `update`, `digest`, `randomUUID`, `set`, `isFinite`, `map`, `unshift`, `filter`, `setUTCDate`, `setUTCHours`, `summaryFor`, `find`, `applyMonthlyCredit`

Each identifier is a call site in this file. Follow the import list to see the defining module; open that module’s MD for parameter and return types.

## Return values (how to read this)

- HTTP route handlers return Express `res.json(...)` bodies (see route docs).
- Zapier `perform` functions return a **single object** (creates) or an **array** (triggers/searches).
- Pricing functions return integer **cents** on `Quote.totalCents`.