public void FacebookLogin(Delegates.UserLoginSuccess successListener, Delegates.UserLoginFail failListener) { FacebookManager.FacebookManagerInstance().FacebookLogin(delegate(string accessToken) { Firebase.Auth.Credential credential = Firebase.Auth.FacebookAuthProvider.GetCredential(accessToken); auth.SignInWithCredentialAsync(credential).ContinueWith(task => { if (task.IsCanceled) { Debug.LogError("SignInWithCredentialAsync was canceled."); failListener("SignInWithCredentialAsync was canceled."); return; } if (task.IsFaulted || task.Exception != null) { Debug.LogError("SignInWithCredentialAsync encountered an error: " + task.Exception); failListener(GetErrorMessage(task.Exception.InnerExceptions [0] as FirebaseException)); return; } Firebase.Auth.FirebaseUser newUser = task.Result; successListener(newUser.UserId); Debug.LogFormat("User signed in successfully: {0} ({1})", newUser.DisplayName, newUser.UserId); }); }, delegate(string error) { failListener(error); }); }