# API Key Authentication
curl -X GET "https://api.example.com/v1/users" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json"

// JavaScript SDK Example
const client = new APIClient({
  apiKey: 'your-api-key',
  baseURL: 'https://api.example.com/v1'
});

curl -X GET "https://api.example.com/v1/users/12345?include=profile,settings" \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "id": "12345",
  "email": "user@example.com",
  "created_at": "2023-01-15T10:30:00Z",
  "profile": {
    "first_name": "John",
    "last_name": "Doe"
  }
}

{
  "email": "string (обязательный)",
  "password": "string (обязательный, минимум 8 символов)",
  "profile": {
    "first_name": "string (опциональный)",
    "last_name": "string (опциональный)"
  }
}

{
  "id": "12346",
  "email": "newuser@example.com",
  "created_at": "2024-01-15T14:30:00Z"
}

{
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters",
    "details": [
      {
        "field": "email",
        "message": "Email address is required"
      }
    ],
    "request_id": "req_1234567890"
  }
}

import requests

headers = {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
}

response = requests.get(
    'https://api.example.com/v1/users/12345',
    headers=headers
)
print(response.json())

const fetch = require('node-fetch');

const response = await fetch('https://api.example.com/v1/users/12345', {
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  }
});
const data = await response.json();
console.log(data);

req, _ := http.NewRequest("GET", "https://api.example.com/v1/users/12345", nil)
req.Header.Set("Authorization", "Bearer YOUR_API_KEY")
req.Header.Set("Content-Type", "application/json")

client := &http.Client{}
resp, _ := client.Do(req)
defer resp.Body.Close()

User:
  type: object
  properties:
    id:
      type: string
      description: Unique user identifier
      example: "usr_1234567890"
    email:
      type: string
      format: email
      description: User's email address
    created_at:
      type: string
      format: date-time
      description: ISO 8601 timestamp
    status:
      type: string
      enum: [active, inactive, suspended]
      description: Current account status

GET /users?filter[status]=active&filter[role]=admin

GET /users?page=2&limit=20

Response headers:
X-Total-Count: 150
X-Page: 2
X-Per-Page: 20
Link: <https://api.example.com/v1/users?page=3>; rel="next"

GET /users?sort=-created_at,email

GET /users?fields=id,email,created_at

curl -X POST "https://api.example.com/v1/payments" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Idempotency-Key: unique-request-id-123" \
  -d '{"amount": 1000}'

X-RateLimit-Limit: 1000
X-RateLimit-Remaining: 999
X-RateLimit-Reset: 1640995200