OAuth2 Token endpoint for Authorization Code flow

OAuth2 Token endpoint that exchanges an authorization code for an access token.

This endpoint is called by the client application to exchange the authorization code received from the authorize endpoint for an access token.

Required parameters:

• grant_type: Must be 'authorization_code'
• code: The authorization code received from the authorize endpoint
• client_id: The OAuth2 client identifier
• client_secret: The OAuth2 client secret
• redirect_uri: Must match the redirect_uri used in the authorization request

Example:

POST /api/v1/auth/oauth2/token
Content-Type: application/x-www-form-urlencoded

grant_type=authorization_code&code=abc123&client_id=123&client_secret=secret456&redirect_uri=https://example.com/callback

Returns an access token that can be used to authenticate API requests.