Please extend the GameCenterPlatform helpers to get authentication information

http://docs.unity3d.com/ScriptReference/SocialPlatforms.GameCenter.GameCenterPlatform.html

https://developer.apple.com/library...ityVerificationSignatureWithCompletionHandler:

After the GKLocalPlayer is authenticated, you can run a "generateIdentityVerificationSignatureWithCompletionHandler" call on it which gives data that can then be used to run...

Please extend the GameCenterPlatform helpers to get authentication information