Stripe Integration

This is the Stripe integration you wish you had before you got paged at 3am about duplicate charges. It covers the complete payment stack: checkout sessions, subscriptions, webhooks, metered billing, and Stripe Connect. The sharp edges table alone is worth it, calling out critical mistakes like skipping webhook signature verification or letting JSON middleware consume the request body before you can verify it. Built by someone who's clearly debugged webhook race conditions and dunning logic in production. Requires supabase-backend, which makes sense since you need somewhere reliable to store subscription state. If you're building anything beyond a trivial payment flow, this handles the paranoia you should have about idempotency, state drift, and webhook ordering.