Product discount promotions are set on individual products and trigger when a shopper adds that product to their cart. There are currently four types of product discount promotions:
Buy one get one free (BOGOF): the shopper buys a product and receives an additional unit of that product for free.
Buy one get something else free (BOGSEF): the shopper buys a product and gets another product of the merchant's choosing for free
Buy (x units) of Product A, get (y units) of Product B for $ or % off per unit: the shopper buys two products, and receives a dollar amount or percentage off each unit product B (up to y units), based on a qualifying number of units of Product A
Apply a $ or % off to Product X: the shopper will receive the specified discount when they add the selected product to the cart