Check out the Firebase Mobile Sample application available here.
Check also our documentation:
Firebase Mobile is a mobile plugin which enables many Firebase features including Analytics, Push notifications, Crash reporting, Performance monitoring, Remote configuration.
It also includes a server side module responsible for device management and sending notifications through Firebase's push notification API.
This plugin is incompatible with other Firebase or Analytics plugins such as:
Compatibility with MABS 8.0 and 7.2