Coupons
Coupons are used in checkout and subscription flows whenever the discount must remain explicit and auditable.
Routes
POST /v1/couponsGET /v1/couponsGET /v1/coupons/{id}PATCH /v1/coupons/{id}POST /v1/coupons/{id}/disablePOST /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.
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