API ReferencePublic APIUpdate mutable coupon fieldsUpdate mutable coupon fields PATCH /v1/coupons/:id Update mutable coupon fields Request Responses200401403404422Coupon updatedAuthentication failedInsufficient permissionResource not foundValidation errorDid this page unblock the next step?ResolvedNeeds improvementFeedback stays inside the docs flow and should never include customer or card data.