post https://api.whop.com/api/v2/promo_codes
Creates a new promo code with the given parameters. A promo code can offer a discount or a free period for a specific set of plans or for all plans in your company. The promo code can be applied to either new users only or all users, and can be limited to a specific number of uses or have unlimited uses. If an expiration date is specified, the promo code will no longer be redeemable after that date.