Free Advanced OneSignal REST API Extension

Does this simple project also have Firebase Authentication? On the same point, recently there’s alot of threads reporting about Firebase Authentication, am not sure if the issue is related to that, because my aix doesn’t have anything to do with authentication file’s eg Googleservices.json,

Seem it’s OneSignal components with Firebase Authentication

To clarify how my aix is intended to be used,

My aix is designed for an admin app, where it uses the OneSignal REST API to send notifications or perform administrative actions.

The user app should use the standard OneSignal component.

These two should be separate apps,
Admin app → uses my aix
User app → uses OneSignal component