Google Sign-In Setup

1. Enable Google Provider in Firebase

1. Go to the Firebase Console.
2. Select Authentication -> Sign-in method.
3. Click on Google, enable it, select a support email, and click Save.

2. Add SHA-1 Fingerprints (Android)

Google Sign-In on Android requires SHA-1 and SHA-256 fingerprint hashes:

1. Generate your app's SHA-1 fingerprint:
   • For debug build, run:

     cd android && ./gradlew signingReport
     

   • For production, get the SHA-1 from your Google Play Console under Release -> Setup -> App signing.
2. Go to Firebase Console -> Project Settings -> General.
3. Scroll down to your Android app and click Add fingerprint.
4. Paste your SHA-1 key and save.
5. Re-download google-services.json and replace it in android/app/google-services.json.

3. iOS URL Schemes Configuration

1. Open your downloaded GoogleService-Info.plist file.

2. Find the key <key>REVERSED_CLIENT_ID</key> and copy its <string> value (e.g. com.googleusercontent.apps.1234567890-abcdefg).

3. Open ios/Runner/Info.plist in your editor or Xcode.

4. Add or update the URL Scheme inside <key>CFBundleURLTypes</key>:

   <key>CFBundleURLTypes</key>
   <array>
       <dict>
           <key>CFBundleTypeRole</key>
           <string>Editor</string>
           <key>CFBundleURLSchemes</key>
           <array>
               <string>YOUR_REVERSED_CLIENT_ID</string>
           </array>
       </dict>
   </array>