It’s one of THE most asked questions on KCL. . . What does the coupon verbiage “Limit 1 Coupon per Purchase” actually mean!?
If you want the short version: With each ITEM you buy, you are making 1 purchase. You can use 1 coupon for every item you purchase. Every time the register scans an item, that constitutes a purchase. Every time you pay, that is a transaction. This verbiage is trying to tell you that you cannot use 2 coupons on 1 item!