An idea from Julio Cesar Sanchez:

If we switch to FCM for iOS too, we shouldn't need to ask for the certificates ourselves anymore, but document that they have to provide them on firebase console, and the same Sender ID and Server Key/token will work for both iOS and Android, so it might simplify the configuration on our part.

I like this idea, and implementation could be quick, since at the end it's really just an "Android Variant".

Perhaps we explicitly call it out FCM/APN mapper ? To avoid confusion w/ the pure Android Variant. Or.... we just give them example doc, how to upload the apple things, to use an Android variant.

Heck, we should rename it "FCM variant", no ?