This video covers configuring restrictions on how many promo codes and vouchers can be applied to an order. For promo codes, a promotions collection property controls stacking at the collection level, restricting the user to one promo code across the whole collection, or at the group level, restricting them to one promotion per group, with specific group IDs listed in a separate property. For vouchers, a cart collection property enables voucher stacking and sets the allowed voucher count. The resulting behavior is shown in both the admin console and the storefront, for one-time orders and subscriptions.

For more information, see Collection Properties – Promotions and Collection Properties – Cart.