How to Implement Google Sign-In in Flutter Using google_sign_in 7.2.0 Without Firebase

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Developers building Flutter apps can now implement Google OAuth authentication directly without relying on Firebase, using the updated google_sign_in package version 7.2.0. The latest version introduces breaking changes from older implementations, requiring explicit initialization and a new authenticate() method, which renders most existing online tutorials outdated. The approach involves obtaining a Google ID token on the client side and sending it to a custom backend, where it must be verified against Google's servers using a library such as google-auth-library for Node.js. Setting up OAuth credentials correctly in the Google Cloud Console — including the right package name, SHA-1 fingerprint, and client IDs for Android, iOS, and web — is critical, as misconfigurations cause silent sign-in failures. This method is particularly suited for projects that already have their own user management and session systems, where adding Firebase would introduce unnecessary complexity.

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