Custom iOS push notification when background/quit state

[vitorcamachoo]

After reading the documentation, it is not very clear how we can get access to the notification event in code when triggered from background/quit state in iOS.
In my project I need some specific logic when receiving the notification and so far I was not able to get any notifee or event message() (firebase) events working.

From the documentation I tried to add data-only payload but it didn't work.
Also, the onBackgroundEvent is not being triggered nor setBackgroundMessageHandler.

What am I missing?