How does in app messaging work with SAB and Firebase?

Hello, I am new the Analytics world and specifically Firebase. I recently discovered I could use it with my SAB apps. I’m trying to understand what I have to do to be able to send in app messages to the users phones. Within SAB I see a setting enabling “firebase messaging (push notifications)” but I’m not sure if this is referring to the “cloud messaging” service, or “in app messages”? Do they require different set up? Can SAB allow both? Thanks for any help!

-Casey

Firebase messaging refers to “Cloud Messaging” in Firebase.