public void Authenticate()
    {
        Debug.Log("Authenticate");
                #if UNITY_IOS
        socialService = new GameCenterService();
                #endif
                #if UNITY_ANDROID && GOOGLE_PLAY_GAMES_ENABLED
        socialService = new GooglePlayService();
        ((GooglePlayService)socialService).Init();
                #endif

        if (socialService != null)
        {
            socialService.Authenticate();
        }
    }