public void initialize()
    {
        UnityInitializer.AttachToGameObject(this.gameObject);
        credentials = new CognitoAWSCredentials(poolid, RegionEndpoint.APNortheast2);

        PlayGamesClientConfiguration config = new PlayGamesClientConfiguration.Builder()
                                                 //.AddOauthScope("https://www.googleapis.com/auth/games")
                                                 //.AddOauthScope("profile")
                                                 .RequestIdToken()
                                                 //.RequestServerAuthCode(false)
                                                 .Build();
        PlayGamesPlatform.InitializeInstance(config);
        PlayGamesPlatform.DebugLogEnabled = true;
        PlayGamesPlatform.Activate();
        Social.localUser.Authenticate(GoogleLoginCallback);
    }

    void GoogleLoginCallback(bool success, string err)
    {
        if(success)
        {
            string token = PlayGamesPlatform.Instance.GetIdToken();
            //string token = ((PlayGamesLocalUser)Social.localUser).GetIdToken();
            //string token = PlayGamesPlatform.Instance.GetServerAuthCode();
            Debug.Log("Token = " + token);
            //credentials.AddLogin("accounts.google.com", token);
        }
        else
        {
            Debug.Log("에러 내용: " + err);
            Debug.LogError("Google login failed. If you are not running in an actual Android/iOS device, this is expected.");
        }
    }