Set up Apple and Game Center

Configure Apple services and sign players in on supported targets.

Use Game Center for Apple’s achievements and leaderboards. Use Sign In with Apple when you need an Apple identity token for your backend or EOS Connect. They are separate sign-ins.

Set up the app

Match your packaged app’s bundle ID to its App Store Connect record and provisioning profile. Enable Game Center for the app and configure its achievements and leaderboards in App Store Connect. Enable the Sign in with Apple capability if you use Apple ID login.

In Project Settings → Betide → Crossplay, the Game Center settings control automatic authentication and the access point. Auto Authenticate On Launch is enabled by default; turn it off if your game starts login manually. Test in a signed iOS or macOS build.

Authenticate with Game Center

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Game module dependencies: GameCenterKit, BetideCore, Engine.

#include "Engine/GameInstance.h"
#include "Nodes/Auth/GCIK_Authentication.h"

DEFINE_LOG_CATEGORY_STATIC(LogGameAppleLogin, Log, All);

void SignInGameCenter(UGameInstance &GameInstance)
{
    auto *Login = UGCIK_Authenticate::Authenticate(&GameInstance);
    if (!Login)
        return;
    const TWeakObjectPtr<UGameInstance> WeakGameInstance(&GameInstance);
    Login->OnSuccessCallback = [WeakGameInstance](const FGCIK_LocalPlayer &Player,
                                                  const FBetideError &) {
        if (WeakGameInstance.IsValid())
            UE_LOG(LogGameAppleLogin, Log, TEXT("Signed in: %s"), *Player.DisplayName);
    };
    Login->OnFailureCallback = [WeakGameInstance](const FGCIK_LocalPlayer &,
                                                  const FBetideError &Error) {
        if (WeakGameInstance.IsValid())
            UE_LOG(LogGameAppleLogin, Warning, TEXT("%s"), *Error.GetLogString());
    };
    Login->Activate();
}

Use Is Authenticated for a check without prompting. Respect Is Multiplayer Restricted before offering multiplayer. In C++, both are on UGCIK_AuthenticationLibrary in the same header.

Get an Apple identity token

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Check stored Apple credentials

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#include "Nodes/AppleSignIn/GCIK_AppleSignInNodes.h"

void RequestAppleToken(
    UObject *WorldContext,
    TFunction<void(const FGCIK_AppleSignInResult &, const FBetideError &)> Completion)
{
    auto *Login = UGCIK_AppleSignIn::SignInWithApple(WorldContext, {});
    if (!Login)
        return;
    Login->OnSuccessCallback = [Completion](const FGCIK_AppleSignInResult &Result,
                                            const FBetideError &Error) {
        UGCIK_AppleSignInLibrary::StoreAppleUserIdentifier(Result.UserIdentifier);
        if (Completion)
            Completion(Result, Error);
    };
    Login->OnFailureCallback = MoveTemp(Completion);
    Login->Activate();
}

The completion receives IdentityToken. Use a weak UObject capture if it updates game objects.

Check stored Apple credentials

Add these methods to your GameInstance class. The node reports through dynamic delegates.

#pragma once
#include "Engine/GameInstance.h"
#include "GameCenterKit.h"
#include "Nodes/AppleSignIn/GCIK_AppleSignInNodes.h"
#include "AppleSignInGameInstance.generated.h"

UCLASS()
class UAppleSignInGameInstance : public UGameInstance
{
    GENERATED_BODY()
  public:
    void CheckAppleCredentials()
    {
        auto *Check = UGCIK_GetAppleCredentialState::GetAppleCredentialState(
            this, UGCIK_AppleSignInLibrary::GetStoredAppleUserIdentifier());
        if (!Check)
            return;
        Check->OnComplete.AddDynamic(this, &UAppleSignInGameInstance::OnAppleCredentials);
        Check->OnFailure.AddDynamic(this, &UAppleSignInGameInstance::OnAppleCredentials);
        Check->Activate();
    }

    UFUNCTION()
    void OnAppleCredentials(EGCIK_AppleCredentialState State, const FBetideError &Error)
    {
        if (Error.IsError())
            UE_LOG(LogGCIK, Warning, TEXT("%s"), *Error.GetLogString());
        else
            UE_LOG(LogGCIK, Log, TEXT("Apple credential state: %d"), static_cast<int32>(State));
    }
};

Pass the token explicitly to your chosen external-auth login. For automatic provider composition, use Login With Crossplay. Never log tokens.

Apple returns requested name/email information only on the first authorization; store it then if needed. Email can be a private relay address. Keep the returned user identifier for credential-state checks; clearing a locally stored identifier does not revoke Apple authorization.

Next: Game Center services.