Testing multi-user app with Game Center integration

We have a turn-based multiplayer game that leverages Game Center. I’m new to appium, but was wondering if anyone has any advice, or if it’s even possible, to test this app with appium? We’d like to launch the app as one user, start a match, take a turn, then start the app as the other user and play the game going back and forth between the users. Possible with appium? Is there a best practice that I’m unaware of for testing stuff like this?