Authorization: Basic base64(client_id:client_secret)
client_id
client_secret
username:password
Authorization: Basic *****************
{ "grant_type": "authorization_code", "code": "string", "client_id": "string", "client_secret": "string", "redirect_uri": "string" }
{ "access_token": "abc123def456...", "token_type": "Bearer", "expires_in": 604800, "scope": "openid profile email", "id_token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6Im9pZGMta2V5LTIwMjQifQ..." }