# Obtain OAuth 2.0 Access Token

Exchange client credentials for an access token

Endpoint: POST /oauth2/token
Version: 1.0.1
Security: oauth2ClientCredentials

## Request fields (application/x-www-form-urlencoded):

  - `grant_type` (string, required)
    Enum: "client_credentials"

  - `client_id` (string, required)
    API client identifier

  - `client_secret` (string, required)
    API client secret

## Response 200 fields (application/json):

  - `access_token` (string)
    JWT access token for API authentication
    Example: "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."

  - `expires_in` (integer)
    Token expiration time in seconds
    Example: 3600

  - `token_type` (string)
    Type of token returned
    Enum: "Bearer"

## Response 400 fields (application/json):

  - `error` (string)
    Human-readable error message
    Example: "invalid_client"