Hi,
as far as I understand from the What's New in Game Center https://developer.apple.com/videos/play/wwdc2016/611/?time=1139 session, in iOS 10, the invites are sent and received through iMessage.
The video contains pointers to MatchMaking through the GKMatchmakerViewController interface.
How do we do programmatic matchmaking in iOS 10? In particular, how do we send an invite to someone in the contacts list?
Jean