Stripe Implementer

This handles the full Stripe integration stack for Next.js and NestJS apps: payment processing, subscription management, webhook handling, and customer data. It covers the main payment flows (Checkout Sessions for simple cases, Payment Intents for custom UIs, and subscription billing) and guides you through webhook verification for events like payment success or subscription updates. The skill emphasizes the security basics like never exposing secret keys client-side and always verifying webhook signatures. If you're adding payments or subscriptions to your app and want to avoid the usual Stripe integration gotchas, this gives you the implementation patterns and best practices in one place.