tag property
The notification tag.
Showing notification with the same (tag, id) pair as a currently visible notification will replace the old notification with the new one, provided the old notification was one that was not one that was scheduled. In other words, the (tag, id) pair is only applicable for notifications that were requested to be shown immediately. This is because the Android AlarmManager APIs used for scheduling notifications only allow for using the id to uniquely identify alarms.
Implementation
final String? tag;