Automatic discounts
You can offer your customers discounts that apply automatically in their cart and at checkout. You can create amount off, free shipping, or buy X get Y automatic discounts. You can have a maximum of 25 active automatic discounts. This total includes app-based discounts.
For an automatic discount to apply correctly, your customers need to add all eligible items to their cart before they move to checkout. This includes the items that they need to buy to qualify for the discount, as well as any items that they get as part of a promotion.