Supabase + Stripe Integration Guide
Supabase and Stripe together provide the complete backend for a SaaS billing system. Supabase stores your application data and user accounts, Stripe handles all payment processing and subscription management, and Supabase edge functions act as the bridge — creating payment sessions and processing Stripe webhook events to keep subscription state in sync.
Why Supabase + Stripe?
Every SaaS needs a billing system, and Stripe is the professional standard. Supabase edge functions (Deno runtime) are the ideal place to host the Stripe webhook handler and payment session creator — they run close to your database, have access to your service role key, and deploy in seconds. The result is a billing system where Stripe is the source of truth for payments and Supabase is the source of truth for your app data, kept in sync via webhooks.
Setting up the integration
Create a customers table in Supabase that stores stripe_customer_id linked to auth.users. Create a subscriptions table storing the Stripe subscription ID, status, plan, and current_period_end. Write two Supabase edge functions: one that creates a Stripe Checkout session (called from your frontend) and one that handles Stripe webhooks (registered in the Stripe dashboard). The webhook function updates your subscriptions table based on checkout.session.completed, customer.subscription.updated, and customer.subscription.deleted events.
Enforcing plan limits with RLS
Once subscription state is in Supabase, you can enforce plan limits at the database level using row-level security policies. A policy might allow INSERT on the projects table only if the user's subscription plan is "pro" or higher. This means plan enforcement is automatic — no frontend code needed, and no way for a user to bypass it. Combine with PostgreSQL functions to count usage and check limits.
Real-world use cases
App Studio's standard SaaS billing setup: Supabase auth + WeWeb or Next.js frontend + Stripe Checkout for plan selection + Supabase edge function webhook handler + RLS-enforced feature flags. This stack handles everything from free trials to enterprise annual contracts. The customer portal (generated by Stripe, linked from your app) handles plan changes, payment method updates, and cancellations without any custom code.
Common pitfalls
Register your Supabase edge function webhook URL in Stripe's dashboard and verify the webhook signature using Stripe's constructEvent() to prevent spoofed requests. Webhooks can arrive out of order — always check the event's created timestamp against what's in your database before updating. Use Stripe's idempotency keys for payment session creation to prevent duplicate charges if your frontend retries. Test the full billing lifecycle (subscribe → upgrade → cancel → resubscribe) in Stripe test mode before launch.
What you can build
- SaaS subscription billing
- Plan tier enforcement
- Usage-based billing
- Free trial management
- Enterprise contracts
Ready to build with Supabase + Stripe?
App Studio has built production apps on this exact stack. We can ship your project in 4–8 weeks and handle the full integration — architecture, setup, and launch.
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