discontinuedPackage dart_firebase_admin has been discontinued and replaced by firebase_admin_sdk.

channelId property

String? channelId

The Android notification channel ID (new in Android O). The app must create a channel with this channel ID before any notification with this channel ID can be received. If you don't send this channel ID in the request, or if the channel ID provided has not yet been created by the app, FCM uses the channel ID specified in the app manifest.

Implementation

final String? channelId;