OptionalandroidOptionalapiAn API key used for authenticating requests from your app, e.g. "AIzaSyDdVgKwhZl0sTTTLZ7iTmt1r3N2cJLnaDk", used to identify your app to Google servers.
The Google App ID that is used to uniquely identify an instance of an app.
OptionalclientiOS only - The OAuth2 client ID for iOS application used to authenticate Google users, for example "12345.apps.googleusercontent.com", used for signing in with Google.
OptionaldatabaseThe database root URL, e.g. "http://abc-xyz-123.firebaseio.com".
OptionaldeepiOS only - The URL scheme used to set up Durable Deep Link service.
OptionalmeasurementThe tracking ID for Google Analytics, e.g. "UA-12345678-1", used to configure Google Analytics.
OptionalmessagingThe Project Number from the Google Developer's console, for example "012345678901", used to configure Google Cloud Messaging.
The Project ID from the Firebase console, for example "abc-xyz-123".
OptionalstorageThe Google Cloud Storage bucket name, e.g. "abc-xyz-123.storage.firebase.com".
iOS only - The Android client ID used in Google AppInvite when an iOS app has its Android version, for example "12345.apps.googleusercontent.com".