Shiny + Firebase + Stripe

I am in the process of building a shiny app which is meant to sit behind a Firebase auth portal that handles Stripe subscription payments.

Luckily, the library firebase allows one to integrate Firebase easily in shiny apps:

Also luckily, there is an extension to Firebase for Stripe to handle payments:

Combining these seems like the cleanest solution compared to similar approaches such as:

While I deeply appreciate these other approaches, I was hoping to leverage the more official solutions described above.

Does anyone know how to integrate the two in shiny (i.e. Firebase + Stripe Extension)?
Are there other solutions to explore that could achieve this?