Stripe Checkout Promotion Codes — Production Kit

Ship Stripe Checkout promotion codes without turning your success page into your source of truth.

A TypeScript / Next.js App Router implementation kit for hosted Checkout, customer-entered promotion codes, signed webhook verification, price allow-listing, and idempotent fulfillment.

Included:

• Checkout Session creator with allow_promotion_codes enabled

• Server-only checkout route using a configured Stripe Price ID

• Raw-body webhook handler with signature verification

• Idempotent fulfillment flow that prevents duplicate grants

• Price allow-list validation

• Production rollout checklist and test matrix

Built for developers with a Stripe account who want a safer production baseline than a Checkout snippet alone. Editable implementation template; connect the persistence interface and entitlement function to your app, then test in Stripe test mode before production.