/// <summary>
 /// Asynchronously retrieves the server auth code for this client.
 /// </summary>
 /// <remarks>Note: This function is currently only implemented for Android.</remarks>
 /// <param name="serverClientId">The Client ID.</param>
 /// <param name="callback">Callback for response.</param>
 public string GetServerAuthCode()
 {
     if (!this.IsAuthenticated())
     {
         Debug.Log("Cannot get API client - not authenticated");
         return(null);
     }
     return(mTokenClient.GetAuthCode());
 }