[firebase_database] How to authenticate with a secondary app?

[ob-juliandixon]

I am working on a project that has a 'Management App' as a single firebase app, then each 'Customer' has their own firebase app and realtime database.

I have been working with the firebase database plugin and I am able to access the databases for every customer, however unless I allow reads from anywhere in the database rules, I get permission denied.

Is there any way I can authenticate with the secondary App I am using in the database?