I have this idea for an app and trying to research if its possible in fusion?

The app itself wouldnt consist of much and would need to simply be "installed", then i would like the ability for the app to receive notifications when required.

I noticed there is a notification extension and mentions the GET object o do a network notification, but I have also eady that the app "pauses" when not in use so i dont understand how it can retrive or check for new notifications?

Any thoughts?