Promotions
Coupon codes and automatic discounts.
Endpoints
Delete a subscription plan DELETE
Retires a subscription plan: it is marked `deleted` and leaves the plan list, but you can still get it by id. Subscriptions already on the plan keep billing as before. Core does not check whether products still use the plan, so move those products first. Secret and trusted tokens may call it; a limited token may not (`403`).
List promotions GET
Returns your coupons, cross-sells and up-sells, oldest first unless you choose another `sort_by`. Secret and trusted tokens may call it.