Coupons

Coupons are used in checkout and subscription flows whenever the discount must remain explicit and auditable.

Routes

• POST /v1/coupons
• GET /v1/coupons
• GET /v1/coupons/{id}
• PATCH /v1/coupons/{id}
• POST /v1/coupons/{id}/disable
• POST /v1/coupons/validate

Operation

Validate the coupon before showing the final total to the buyer. For auditability, persist coupon_id, the submitted code and the final discount in cents.