I know it all works, all you need to do is download json and put it in a folder.
google-services.json has nothing to do with it. I was looking in the plugin folder for something separate built into the plugin. Maybe the plugin also accesses its json.
google-services.json works! Authentication, cloud storage is working. The BP database functions simply stopped working.
The Firestore database and Firebase itself have also been working great for over a year in other non-UE applications. I also wrote a development on Github, I’m just not sure that he will answer or at least answer in the near future