This document outlines the architecture plan for the "API Documentation Generator" and provides a study plan for understanding and developing such a system.

API Documentation Generator: Architecture Plan

1. Introduction

The "API Documentation Generator" is designed to automate the creation of high-quality, professional API documentation. Its primary goal is to transform raw API definitions into comprehensive, user-friendly documentation that includes detailed endpoint descriptions, accurate request/response examples, clear authentication guides, and practical SDK usage examples across multiple programming languages. This automation streamlines the documentation process, ensures consistency, and reduces manual effort, thereby accelerating developer onboarding and improving API adoption.

2. High-Level System Architecture

The generator follows a modular architecture, enabling flexibility in input sources, processing logic, and output formats.

bash

curl -X POST \

https://api.example.com/v1/products \

-H 'Authorization: Bearer your_access_token_here' \

-H 'Content-Type: application/json'

This document provides comprehensive, detailed, and professional API documentation for the Order Management System (OMS) API. It covers everything from authentication and base URLs to specific endpoint descriptions, request/response examples, data models, error handling, and SDK usage.

Order Management System (OMS) API Documentation

Welcome to the Order Management System (OMS) API documentation. This API allows developers to programmatically manage customer orders, products, and inventory within an e-commerce or retail system. Utilize this API to integrate order creation, retrieval, updates, and deletions into your applications, manage product catalogs, and query inventory levels.

Table of Contents

1. [API Overview](#1-api-overview)
2. [Authentication](#2-authentication)

* [API Key Authentication](#api-key-authentication)

* [Obtaining Your API Key](#obtaining-your-api-key)

1. [Base URL](#3-base-url)
2. [Endpoints](#4-endpoints)

* [Orders](#orders)

* [GET /orders](#get-orders)

* [GET /orders/{orderId}](#get-ordersorderid)

* [POST /orders](#post-orders)

* [PUT /orders/{orderId}](#put-ordersorderid)

* [DELETE /orders/{orderId}](#delete-ordersorderid)

* [Products](#products)

* [GET /products](#get-products)

* [GET /products/{productId}](#get-productsproductid)

* [Inventory](#inventory)

* [GET /inventory/{productId}](#get-inventoryproductid)

1. [Data Models](#5-data-models)

* [Order Object](#order-object)

* [OrderItem Object](#orderitem-object)

* [Product Object](#product-object)

* [Inventory Object](#inventory-object)

* [Error Object](#error-object)

1. [Error Handling](#6-error-handling)
2. [Rate Limiting](#7-rate-limiting)
3. [SDK Usage Examples](#8-sdk-usage-examples)

* [Python SDK](#python-sdk)

* [Node.js SDK](#nodejs-sdk)

1. [Changelog](#9-changelog)

1. API Overview

The OMS API is a RESTful API designed to provide robust control over your order management workflows. It supports standard HTTP methods (GET, POST, PUT, DELETE) and uses JSON for all request and response bodies.

Key Features:

• Order Management: Create, retrieve, update, and delete customer orders.
• Product Catalog: Access detailed information about products.
• Inventory Tracking: Query current stock levels for products.

2. Authentication

The OMS API uses API Key Authentication to secure access. Your API key must be included in the X-API-Key HTTP header for every request.

API Key Authentication

To authenticate your requests, include your secret API key in the X-API-Key header.

Example Header:

X-API-Key: YOUR_SECRET_API_KEY

Important: Keep your API key confidential. Do not expose it in client-side code, public repositories, or unsecured environments. If your API key is compromised, revoke it immediately and generate a new one.

Obtaining Your API Key

1. Log in to your OMS Developer Dashboard.
2. Navigate to the "API Keys" section.
3. Generate a new API key. You will typically be able to assign a name or description to it for better organization.
4. Copy your API key. It will only be shown once upon generation.

3. Base URL

All API requests should be made to the following base URL:

https://api.oms.example.com/v1

4. Endpoints

This section details all available API endpoints, their methods, paths, parameters, and provides request/response examples.

Orders

Manage customer orders.

GET /orders

• Description: Retrieves a list of all orders, optionally filtered or paginated.
• Method: GET
• Path: /orders
• Query Parameters:

* status (optional, string): Filter orders by status (e.g., pending, shipped, delivered).

* customer_id (optional, string): Filter orders by a specific customer ID.

* limit (optional, integer): Maximum number of orders to return per page (default: 20, max: 100).

* offset (optional, integer): Number of orders to skip for pagination (default: 0).

• Responses:

* 200 OK: A list of order objects.

Request Example (cURL):

curl -X GET \
  'https://api.oms.example.com/v1/orders?status=pending&limit=10' \
  -H 'X-API-Key: YOUR_SECRET_API_KEY'

Response Example (200 OK):

[
  {
    "orderId": "ord_abc123",
    "customerId": "cust_xyz789",
    "orderDate": "2023-10-26T10:00:00Z",
    "status": "pending",
    "totalAmount": 120.50,
    "items": [
      {
        "productId": "prod_a1b2",
        "quantity": 1,
        "price": 75.00
      },
      {
        "productId": "prod_c3d4",
        "quantity": 2,
        "price": 22.75
      }
    ]
  },
  {
    "orderId": "ord_def456",
    "customerId": "cust_pqr012",
    "orderDate": "2023-10-25T14:30:00Z",
    "status": "shipped",
    "totalAmount": 49.99,
    "items": [
      {
        "productId": "prod_e5f6",
        "quantity": 1,
        "price": 49.99
      }
    ]
  }
]

GET /orders/{orderId}

• Description: Retrieves a specific order by its ID.
• Method: GET
• Path: /orders/{orderId}
• Path Parameters:

* orderId (required, string): The unique identifier of the order.

• Responses:

* 200 OK: The requested order object.

* 404 Not Found: If no order with the specified orderId exists.

Request Example (cURL):

curl -X GET \
  'https://api.oms.example.com/v1/orders/ord_abc123' \
  -H 'X-API-Key: YOUR_SECRET_API_KEY'

Response Example (200 OK):

{
  "orderId": "ord_abc123",
  "customerId": "cust_xyz789",
  "orderDate": "2023-10-26T10:00:00Z",
  "status": "pending",
  "totalAmount": 120.50,
  "items": [
    {
      "productId": "prod_a1b2",
      "quantity": 1,
      "price": 75.00
    },
    {
      "productId": "prod_c3d4",
      "quantity": 2,
      "price": 22.75
    }
  ],
  "shippingAddress": {
    "street": "123 Main St",
    "city": "Anytown",
    "state": "CA",
    "zipCode": "90210",
    "country": "USA"
  }
}

POST /orders

• Description: Creates a new order.
• Method: POST
• Path: /orders
• Request Body: A JSON object representing the new order.

* customerId (required, string): The ID of the customer placing the order.

* items (required, array of OrderItem objects): The list of products and quantities in the order.

* shippingAddress (required, object): The shipping address details.

• Responses:

* 201 Created: The newly created order object.

* 400 Bad Request: If the request body is invalid or missing required fields.

Request Example (cURL):

curl -X POST \
  'https://api.oms.example.com/v1/orders' \
  -H 'X-API-Key: YOUR_SECRET_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
        "customerId": "cust_new001",
        "items": [
          {
            "productId": "prod_g7h8",
            "quantity": 3,
            "price": 15.00
          },
          {
            "productId": "prod_i9j0",
            "quantity": 1,
            "price": 99.99
          }
        ],
        "shippingAddress": {
          "street": "456 Oak Ave",
          "city": "Otherville",
          "state": "NY",
          "zipCode": "10001",
          "country": "USA"
        }
      }'

Response Example (201 Created):

{
  "orderId": "ord_new789",
  "customerId": "cust_new001",
  "orderDate": "2023-10-26T15:30:00Z",
  "status": "pending",
  "totalAmount": 144.99,
  "items": [
    {
      "productId": "prod_g7h8",
      "quantity": 3,
      "price": 15.00
    },
    {
      "productId": "prod_i9j0",
      "quantity": 1,
      "price": 99.99
    }
  ],
  "shippingAddress": {
    "street": "456 Oak Ave",
    "city": "Otherville",
    "state": "NY",
    "zipCode": "10001",
    "country": "USA"
  }
}

PUT /orders/{orderId}

• Description: Updates an existing order. Only fields provided in the request body will be updated.
• Method: PUT
• Path: /orders/{orderId}
• Path Parameters:

* orderId (required, string): The unique identifier of the order to update.

• Request Body: A JSON object containing the fields to update.

* status (optional, string): New status for the order.

* shippingAddress (optional, object): New shipping address details.

items (optional, array of OrderItem objects): New list of items (this will replace* existing items).

• Responses:

* 200 OK: The updated order object.

* 400 Bad Request: If the request body is invalid.

* 404 Not Found: If no order with the specified orderId exists.

Request Example (cURL):

curl -X PUT \
  'https://api.oms.example.com/v1/orders/ord_abc123' \
  -H 'X-API-Key: YOUR_SECRET_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
        "status": "shipped",
        "shippingAddress": {
          "street": "789 Pine Ln",
          "city": "Newtown",
          "state": "TX",
          "zipCode": "73301",
          "country": "USA"
        }
      }'

Response Example (200 OK):

{
  "orderId": "ord_abc123",
  "customerId": "cust_xyz789",
  "orderDate": "2023-10-26T10:00:00Z",
  "status": "shipped",
  "totalAmount": 120.50,
  "items": [
    {
      "productId": "prod_a1b2",
      "quantity": 1,
      "price": 75.00
    },
    {
      "productId": "prod_c3d4",
      "quantity": 2,
      "price": 22.75
    }
  ],
  "shippingAddress": {
    "street": "789 Pine Ln",
    "city": "Newtown",
    "state": "TX",
    "zipCode": "73301",
    "country": "USA"
  }
}

DELETE /orders/{orderId}

• Description: Deletes a specific order by its ID.
• Method: DELETE
• Path: /orders/{orderId}
• Path Parameters:

* orderId (required, string): The unique identifier of the order to delete.

• Responses:

*