Google & Apple Sign-In in Flutter

Short summary

Master production-ready Google and Apple Sign-In implementation in Flutter with a complete, clean auth service. The guide covers Firebase configuration, environment variables, platform-specific requirements (critical: Web client ID on Android), prevents common failures like uninitialized GoogleSignIn, and provides full code examples. Learn error-prevention patterns and real production integration from a working app.

• •Step-by-step Firebase and Google Cloud Console configuration with serverClientId setup
• •Platform-specific guidance: why Web client ID is required for Android, common iOS/Android pitfalls
• •Complete AuthService implementation with error handling and production patterns

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