public void Authenticate(string email, string password, PlayFabAuthTypes type)
        {
            _authService.SetDisplayName(null);
            _authService.AuthType = type;
            _authService.Email    = email;
            _authService.Password = password;
            _authService.AuthenticateToPhotonAfterLogin = true;

            Deferred def = GameAuthSdk.Authenticate(_authService);

            if (def.isDone)
            {
                if (def.isFulfilled)
                {
                    _onAuthComplete?.Invoke();
                }
                else
                {
                    Debug.LogError(def.error.Message);
                    _onAuthFail?.Invoke();
                }
            }
            else
            {
                IEnumerator Routine(Deferred aDef)
                {
                    yield return(aDef.Wait());

                    if (aDef.isFulfilled)
                    {
                        _onAuthComplete?.Invoke();
                    }
                    else
                    {
                        Debug.LogError(aDef.error.Message);
                        _onAuthFail?.Invoke();
                    }
                }

                StartCoroutine(routine: Routine(def));
            }
        }