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Place the downloaded google-services.json inside android/app/. The video shows how to add the classpath 'com.google.gms:google-services:4.3.15' line in the root build.gradle and apply the plugin in the app module. A common mistake is forgetting to bump the minSdkVersion to at least 21, which causes a build failure.
After syncing Gradle, run flutter run to ensure the app still launches. This step prepares the native side to receive FCM tokens.
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