Stratkit Google Sign-In

Native Google Sign-In wrapper for Unity. Provides an async API to authenticate users via Google and retrieve an ID token for backend verification.

Supported Platforms

Platform	SDK	Min Version
Android	Credential Manager (androidx.credentials)	API 21+
iOS	Google Sign-In SDK 8.x	iOS 15.0+
Editor	Mock provider (returns test token)	-

Setup

1. Google Cloud Console

Create OAuth 2.0 client IDs in Google Cloud Console:

• Web application client ID — used as WebClientId (required for both platforms)
• iOS client ID — used as IosClientId (required for iOS builds)

Android uses the Web Client ID directly with Credential Manager; no separate Android client ID is needed.

2. Configuration Asset

Create a GoogleSignInConfiguration ScriptableObject:

Right-click in Project > Create > Stratkit > Google Sign-In > GoogleSignInConfiguration

Fill in: - WebClientId — your Web application OAuth client ID - IosClientId — your iOS OAuth client ID (leave empty if iOS is not needed)

3. Initialize at Startup

Call Configure() once during bootstrap, before any sign-in attempt:

GoogleSignInService.Configure(googleSignInConfiguration);

4. Sign In

try {
    GoogleSignInResult result = await GoogleSignInService.SignInAsync();
    string idToken = result.IdToken;
    // Send idToken to your backend for verification
} catch (GoogleSignInException e) {
    // Handle error (e.ErrorCode for specific failure reason)
}

Native SDK Dependencies

Native dependencies are managed via EDM4U (External Dependency Manager for Unity). The Editor/GoogleSignInDependencies.xml file declares:

Android: - androidx.credentials:credentials:1.3.0 - androidx.credentials:credentials-play-services-auth:1.3.0 - com.google.android.libraries.identity.googleid:googleid:1.1.1

iOS: - GoogleSignIn CocoaPod ~> 8.0

Run Assets > External Dependency Manager > Resolve after importing the package.

Build Post-Processing

The GoogleSignInBuildProcessor automatically handles:

• iOS: Adds the reversed client ID as a URL scheme in Info.plist (required by the Google Sign-In SDK)
• Android: Validates configuration at build time

API Reference

Type	Description
GoogleSignInService	Static entry point — Configure() and SignInAsync()
GoogleSignInResult	Result containing IdToken, Email, DisplayName, UserId
GoogleSignInConfiguration	ScriptableObject with OAuth client IDs and scopes
GoogleSignInException	Exception with ErrorCode (Cancelled, NetworkError, ConfigurationError, etc.)