Keystone Natural Beef review for Bigblue Automatic Free Gifts

I could not get this app to work. As another review said, it requires you to create a discount code in Shopify first, then you can use that code in the app, but I could not get it to work. I also tried not requiring a code to see if that was the problem. Nope! It's such a bummer; I need exactly what this app promises.