DevToDev.SDK.UserID = "activeUserId"; //cross-platform user identifier (64 symbols max.)
* <param name="appKey">App ID</param>
* <param name="appSecret">Application secret key</param>
DevToDev.SDK.Initialize(string appKey, string appSecret);
* <param name="level">Current level</param>
DevToDev.SDK.SetCurrentLevel(int level);