# `zappier/billing-nats`

**Package:** `zappier`  
**Source:** `packages/zappier/src/billing-nats.ts`  
**Lines:** 138

## What this module is

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

## Exports

`BILLING_SUBJECTS`, `AUTHZ_CHECK`, `AccessPlane`, `BillingStatement`, `natsStatement`, `natsAdjust`, `natsPublish`

## Types / interfaces / classes

| Kind | Name |
|------|------|
| type | `AccessPlane` |
| type | `BillingStatement` |
| type | `Nc` |

## Functions

| Name | Parameters | Param types (JSDoc) | Returns | Calls (same file / helpers) |
|------|------------|---------------------|---------|-----------------------------|
| `nc` | `(none)` | — | `unknown` | see Call graph |
| `encode` | `obj: unknown` | — | `unknown` | see Call graph |
| `decode` | `buf: Uint8Array` | — | `unknown` | see Call graph |
| `authzAllow` | `plane: AccessPlane,
  subject: string,
  extra: { principal?: string; kind?: string; veraeUserId?: string } = {},` | — | `unknown` | see Call graph |
| `natsStatement` | `customerId: string,
  plane: AccessPlane = 'web',
  veraeUserId?: string,` | — | `unknown` | see Call graph |
| `natsAdjust` | `payload: {
    customerId: string;
    veraeUserId?: string;
    cents: number;
    reason: string;
    agent: string;
    kind?: string;
  },
  plane: AccessPlane = 'staff',` | — | `unknown` | see Call graph |
| `natsPublish` | `subject: string, payload: unknown, plane: AccessPlane = 'api'` | — | `unknown` | see Call graph |

## Methods (class / object)

| Name | Parameters |
|------|------------|
| `void` | `async (` |

## What it imports / requires

_No imports detected._

## Call graph (identifiers invoked)

`unset`, `nc`, `async`, `import`, `connect`, `split`, `encode`, `stringify`, `decode`, `parse`, `authzAllow`, `request`, `fetch`, `replace`, `json`, `natsStatement`, `natsAdjust`, `natsPublish`, `void`, `publish`

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`.