private IEnumerator LoadLeaderboardData(AbstractLeaderboard.LeaderboardType type, System.Action <List <Entry> > onDataCallback)
        {
            while (isReady == false)
            {
                yield return(null);
            }

            _onLeaderboardLoadedCallback = onDataCallback;
            _leaderboard.GetLeaderboardByType(type, leaderboardEntriesCount);
        }
 static public void GetLeaderboardByType(AbstractLeaderboard.LeaderboardType type, System.Action <List <Entry> > onDataCallback)
 {
     _instance.StartLoadingCoroutine(_instance.LoadLeaderboardData(type, onDataCallback));
 }