# Handle Instagram OAuth callback

Handles the OAuth callback from Instagram after user authorization.
Exchanges the authorization code for access tokens, fetches user profile,
and creates/updates the social account. Redirects to the redirect URI
specified in the original request with a status query parameter.

Endpoint: GET /oauth/instagram/callback
Version: 0.1.0

## Query parameters:

  - `code` (string, required)
    Authorization code returned by Instagram
    Example: "AQBx..."

  - `state` (string, required)
    State token for CSRF protection and context
    Example: "eyJhbGc..."

## Response 400 fields (application/json):

  - `error` (string, required)
    Error code
    Example: "VALIDATION_ERROR"

  - `message` (string, required)
    Human-readable error message
    Example: "Invalid email address or password format"

  - `details` (object)
    Additional error details (optional)

  - `requestId` (string)
    Unique request identifier for tracing (included in X-Request-ID header)
    Example: "550e8400-e29b-41d4-a716-446655440000"

  - `timestamp` (string, required)
    ISO 8601 timestamp when the error occurred
    Example: "2024-01-01T00:00:00Z"

## Response 500 fields (application/json):

  - `error` (string, required)
    Error code
    Example: "VALIDATION_ERROR"

  - `message` (string, required)
    Human-readable error message
    Example: "Invalid email address or password format"

  - `details` (object)
    Additional error details (optional)

  - `requestId` (string)
    Unique request identifier for tracing (included in X-Request-ID header)
    Example: "550e8400-e29b-41d4-a716-446655440000"

  - `timestamp` (string, required)
    ISO 8601 timestamp when the error occurred
    Example: "2024-01-01T00:00:00Z"


## Response 302 fields