# API Contract Specification

**Document ID:** `api-[feature]-[id]-[name]`
**Status:** <!-- TODO: Draft | In Review | Approved | Deprecated -->
**Owner:** <!-- TODO: Team/Individual Name -->
**Last Updated:** <!-- TODO: YYYY-MM-DD -->

## Overview

**Purpose:** <!-- TODO: Brief description of API's purpose and primary use cases -->

**Base URL:** <!-- TODO: e.g., `https://api.example.com/v1` -->

**API Version:** <!-- TODO: e.g., v1 -->

**Stability:** <!-- TODO: Stable | Beta | Experimental -->

## Authentication

**Method:** <!-- TODO: API Key | OAuth 2.0 | JWT | Basic Auth -->

**Implementation:**
<!-- TODO: Document authentication implementation, e.g.:
```http
Authorization: Bearer {token}
```
-->

**Token Acquisition:** <!-- TODO: Brief description of how clients obtain credentials -->

**Scopes/Permissions:** <!-- TODO: List required permissions if applicable -->

## Rate Limiting

**Limits:**
<!-- TODO: Define rate limits for different tiers, e.g.:
- Anonymous: X requests/minute
- Authenticated: Y requests/minute
- Premium: Z requests/minute
-->

**Headers:**
<!-- TODO: Document rate limit headers, e.g.:
```http
X-RateLimit-Limit: 100
X-RateLimit-Remaining: 95
X-RateLimit-Reset: 1234567890
```
-->

**Exceeded Limit Response:** <!-- TODO: Document behavior when rate limit exceeded, e.g., HTTP 429 with Retry-After header -->

## Endpoints

### <!-- TODO: Resource Name -->

#### <!-- TODO: List [Resources] -->
```http
GET /<!-- TODO: endpoint path -->
```

**Query Parameters:**
<!-- TODO: Document query parameters in table format:
| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| `param1` | type | Yes/No | Description |
-->

**Response:** <!-- TODO: Status code, e.g., `200 OK` -->
<!-- TODO: Document response format:
```json
{
  "data": [],
  "pagination": {}
}
```
-->

#### <!-- TODO: Get [Resource] -->
```http
GET /<!-- TODO: endpoint path with parameter -->
```

**Path Parameters:**
<!-- TODO: Document path parameters:
| Parameter | Type | Description |
|-----------|------|-------------|
| `id` | string | Description |
-->

**Response:** <!-- TODO: Status code and example response -->

#### <!-- TODO: Create [Resource] -->
```http
POST /<!-- TODO: endpoint path -->
```

**Request Body:**
<!-- TODO: Document request body schema:
```json
{
  "field": "value"
}
```
-->

**Response:** <!-- TODO: Status code and example response -->

#### <!-- TODO: Update [Resource] -->
```http
PUT /<!-- TODO: endpoint path -->
PATCH /<!-- TODO: endpoint path -->
```

**Request Body:** <!-- TODO: Document request body requirements -->

**Response:** <!-- TODO: Status code and example response -->

#### <!-- TODO: Delete [Resource] -->
```http
DELETE /<!-- TODO: endpoint path -->
```

**Response:** <!-- TODO: Status code, e.g., `204 No Content` -->

## Data Models

### <!-- TODO: Model Name -->
<!-- TODO: Document data model fields:
| Field | Type | Required | Description |
|-------|------|----------|-------------|
| `id` | string | Yes | Unique identifier |
| `field` | type | Yes/No | Description |
-->

**Constraints:**
<!-- TODO: Document validation rules and constraints:
- Constraint description
-->

## Error Handling

**Error Response Format:**
<!-- TODO: Document error response structure:
```json
{
  "error": {
    "code": "error_code",
    "message": "Error message",
    "details": [],
    "request_id": "req_id"
  }
}
```
-->

**Standard Error Codes:**
<!-- TODO: Document error codes:
| HTTP Status | Error Code | Description |
|-------------|------------|-------------|
| 400 | `validation_error` | Invalid request data |
| 401 | `authentication_error` | Missing or invalid credentials |
-->

## Pagination

<!-- TODO: Document pagination approach (offset-based, cursor-based, etc.):
**Offset-Based Pagination:**
```http
GET /resources?limit=20&offset=40
```

**Response Format:**
```json
{
  "data": [],
  "pagination": {
    "total": 100,
    "limit": 20,
    "offset": 40
  }
}
```
-->

## Webhooks

<!-- TODO: OPTIONAL - Remove this section if webhooks are not applicable

**Supported Events:**
- Event description

**Webhook Payload:**
```json
{
  "id": "evt_id",
  "type": "event.type",
  "data": {}
}
```

**Endpoint Requirements:**
- Requirement description

**Signature Verification:**
- Verification method

**Retry Policy:**
- Retry strategy
-->