private static extern void _SetSDKJoinedCafeDelegate(NCSDKJoinedCafeDelegate callback);
private static extern void _SetSDKJoinedCafeDelegate(NCSDKJoinedCafeDelegate callback);
private static extern void _SetSDKJoinedCafeDelegate(NCSDKJoinedCafeDelegate callback);
private static extern void _SetSDKJoinedCafeDelegate(NCSDKJoinedCafeDelegate callback);