Game Center - Turn based - Exchanges

Hi,

we are planing a turn based game center game (asynchronous multiplayer) - but the game has one point, when all players have to make a decision simultaneously. As far as I understood the exchange functionality added to game center in iOS 7 and above is useful for this kind of things, but not supported by the game center plugin, yet.

Can anybody give me a starting point for a possible solution? Is it possible to make some kind of “life exchange” with the current plugin or should we better go for a service like photon cloud?

Kind regards,

Tobias