I need Google and Apple sign in for a mobile app

To add Google Sign-In and Apple Sign In to a mobile app, you usually implement OAuth/OpenID Connect on the app side and a backend to verify tokens and create your own session/JWT.

Typical approach

1. Mobile app
   • Use Google Sign-In SDK / Firebase Auth / AppAuth.
   • Use Apple Sign In via the native iOS APIs.
2. Backend
   • Verify the provider tokens.
   • Create your own user record/session.
3. Account linking
   • If a user signs in with both Google and Apple, link them to one app account by email or a backend user ID.

Recommended options

Option A: Use Firebase Auth

Fastest path if you want both providers with less backend work.

• Supports Google and Apple
• Handles token exchange and session management
• Still may need backend if you have your own API

Option B: Use your own auth backend

Better if you want full control.

• Google: OAuth 2.0 / OpenID Connect
• Apple: Sign in with Apple + JWT verification
• You issue your own access/refresh tokens

Platform notes

iOS

• Apple Sign In is often required if you offer other social sign-ins.
• You’ll need:
  • Apple Developer account
  • Sign in with Apple capability enabled
  • Proper nonce handling

Android

• Google Sign-In is straightforward with Google Identity services.
• Apple Sign In is less common on Android, but can be done through a web-based OAuth flow if needed.

Basic backend flow

1. App gets id_token from Google or Apple.
2. App sends token to backend.
3. Backend verifies:
   • issuer
   • audience/client ID
   • signature
   • expiration
4. Backend finds or creates user.
5. Backend returns app JWT/session.

If you want the quickest setup

Tell me your stack and I can give you:

• React Native setup
• Flutter setup
• iOS native setup
• Android native setup
• Firebase Auth setup
• Custom backend setup

If you want, I can also provide step-by-step implementation code for your app framework.