public void LoadMoreScores(ScorePageToken token, int rowCount, Action <LeaderboardScoreData> callback)
 {
     if (!IsAuthenticated())
     {
         Logger.e("LoadMoreScores can only be called after authentication.");
         callback(new LeaderboardScoreData(token.LeaderboardId, ResponseStatus.NotAuthorized));
     }
     else
     {
         mClient.LoadMoreScores(token, rowCount, callback);
     }
 }