While browsing the AppUp developer resources, i could not find any information regarding Multiplayer/Online-features. How am i supposed to port those features like
-Matchmaking
-Online-Highscores
-Online-Achievements
of an iOS-game, that have been originally implemented with GameCenter?
On iOS, all of this is already available with GameCenter and accessed through the highlevel GameKit-framework. Is there any equivalent service for the AppUp-platform?

Thanks,
Florian