I am not seeing a way to build a coupon code that will work with this:
Buy 1 item, get the second item for a $1 in multiple sets
Setting up a coupon for one pair is easy.
Cart discount of item price less $1.
But can’t find how to discount if someone orders say 3 total items but won’t discount the third until a 4th is added to the cart, ie, 3 items in cart will only discount two.