Backend architecture for a subscription app

A practical architecture for a subscription/credit-based mobile app:

• Use Firebase or Supabase, start with anonymous login.
• Route buy, sell, trade — whatever there is — through Adapty or RevenueCat via webhooks.
• Manage credit spend with the functions feature available on both, or with an event-driven setup.

This keeps payment and credit logic on solid ground without forcing the user up front (anonymous login).