firebase.json

{
    "flutter": {
        "platforms": {
            "android": {
                "default": {
                    "projectId": "grex-ed282",
                    "appId": "1:845872905568:android:691c8e8b71b664086f7205",
                    "fileOutput": "android/app/google-services.json"
                }
            },
            "dart": {
                "lib/firebase_options.dart": {
                    "projectId": "grex-ed282",
                    "configurations": {
                        "android": "1:845872905568:android:691c8e8b71b664086f7205",
                        "ios": "1:845872905568:ios:200d07af1e0875c76f7205",
                        "web": "1:845872905568:web:4313b81048db1f456f7205"
                    }
                }
            }
        }
    }
}