Authentication failure
Status code: 401
{ "message": "Unauthorized" }
Internal server error
Status code: 500
{ "message": "Internal server error" }
Validation failure
Status code: 400
{ "code": "INVALID", "message": "Something is invalid" }
Permission denial
Status code: 403
{ "code": "FORBIDDEN", "message": "This is not allowed" }
Not found
Status code: 404
{ "code": "NOT_FOUND", "message": "This does not exist" }
Failure
Status code: 500
{ "code": "E_FAILED", "message": "Something went wrong" }