Have a repository on GitHub? Planning on making a repository on GitHub? This checklist is intended to introduce you to various features that may help you make the most of your GitHub repository with specific recommendations for C# repositories.
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Even tho Unity has implemented a game-center api (Social api) it doesn't have a way to generate a verification signature, which you need to use game-center as a authentication method.
Luckily the objective-c code required is pretty straight forward. (Apple documentation: generateIdentityVerificationSignature)
#import <Foundation/Foundation.h>
#import <GameKit/GameKit.h>
typedef void (*IdentityVerificationSignatureCallback)(const char * publicKeyUrl, const char * signature, int signatureLength, const char * salt, int saltLength, const uint64_t timestamp, const char * error);