Building a Stripe Subscription Backend with FastAPI

Many Stripe tutorials stop at Checkout integration . But real SaaS products require more than that. A production subscription backend must handle: subscription state management webhook processing access control expiration logic duplicate webhook protection To explore this architecture, I built a small project: FastAPI Revenue Core Repository https://github.com/hiro-kuroe/fastapi-revenue-core This project demonstrates a minimal SaaS-style subscription backend using FastAPI and Stripe. What This Project Implements The backend includes the essential components required for subscription-based services. JWT authentication Stripe Checkout integration Stripe Webhook processing Subscription state engine Automatic expiration logic Docker deployment The goal was to build a reusable revenue backend foundation that could power subscription products. Architecture The system is intentionally simple. Client ↓ FastAPI API ↓ Stripe Checkout ↓ Stripe Webhook ↓ Subscription Status Engine Stripe handles p