PlumberUltimateAds/Assets/GoogleSignIn/GoogleSignInController.cs

using UnityEngine;
using Google;
using System.Threading.Tasks;

public class GoogleSignInController : MonoBehaviour
{
    private GoogleSignInConfiguration configuration;

    void Awake()
    {
        // Set up the Google Sign-In configuration
        configuration = new GoogleSignInConfiguration
        {
            WebClientId = "624507103444-6agok4g1q29bsb615v235jbf0k585ruk.apps.googleusercontent.com",
            RequestEmail = true,
            RequestIdToken = false,  // ❌ We no longer request IdToken, since we use ServerAuthCode instead
            RequestAuthCode = true   // ✅ Enable ServerAuthCode for secure backend authentication
        };

        GoogleSignIn.Configuration = configuration;
    }

    public void SignInWithGoogle()
    {
        GoogleSignIn.DefaultInstance.SignIn().ContinueWith(OnGoogleSignIn);
    }

    private void OnGoogleSignIn(Task<GoogleSignInUser> task)
    {
        if (task.IsFaulted)
        {
            Debug.LogError("Google Sign-In encountered an error: " + task.Exception);
        }
        else if (task.IsCanceled)
        {
            Debug.Log("Google Sign-In was canceled.");
        }
        else
        {
            GoogleSignInUser user = task.Result;
            Debug.Log("✅ Google Sign-In succeeded!");
            Debug.Log("👤 Display Name: " + user.DisplayName);
            Debug.Log("📧 Email: " + user.Email);
            Debug.Log("🔑 Server Auth Code: " + user.AuthCode);

            // 🔹 Send this AuthCode to your backend (PlayFab, Firebase, or custom server)
            // The backend will exchange this for an access token.
        }
    }
}