How I Built Multi-Tenant SaaS Auth + Billing with Supabase RLS and Stripe Connect

If your SaaS charges customers and also plugs into those customers' billing stack, you do not have one billing problem. You have two. You need to bill your own customer for your product. Then you need to safely ingest billing events from that customer's Stripe account without letting tenants see each other's data, leaking service-role access into the frontend, or building a fragile webhook mess you cannot debug later. That was the shape of Rebill for me. Rebill is a failed-payment recovery SaaS.