Implementing Google Authentication in Flutter Without Firebase: Using the Latest google_sign_in (7.2.0)

Short summary

For Flutter projects with existing backends, implementing Google Sign-In directly via google_sign_in 7.2.0 is simpler than Firebase. The key flow: initialize with server client ID, authenticate, retrieve ID token, and verify on backend. Since most tutorials are outdated for v7.2.0, this guide covers the current working approach.

• •Use google_sign_in 7.2.0 directly when you already have a backend (Firebase adds unnecessary complexity)
• •Flow: initialize → authenticate → get ID token → verify on backend (not optional)
• •Current tutorials are outdated; this covers v7.2.0 changes with working code examples

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