ErrForbidden code: 403 message: permission denied.

ErrInternalServerError code: 500 message: internal server error.

ErrInvalidPayload code: 400 message: invalid payload.

ErrNotFound code: 404 message: not found.

ErrNotImplemented code: 400 message: route not implemented.

ErrPasswordsNotEqual code: 400 message: passwords not equal.

ErrServiceDisabled code: 400 message: service disabled.

ErrServiceNotConfigured code: 400 message: service not configured.

ErrTokenExpired code: 401 message: token expired.

ErrUnauthorized code: 401 message: unauthorized.

ErrUnknownType code: 400 message: unknown type.

ErrUserExists code: 409 message: user already exists.

ErrUserIdNotSpecified code: 400 message: user id not specified.

ErrUserNotFoundError code: 404 message: sendmail service error.