Gift app - at check out

Gift App   In connection with trading for a certain amount of money you should at our checkout currently being offered a gift that you can add to the shopping basket. The different steps of the app: 1. You shop and put items in your shopping basket 2. You click proceed to checkout (During the goods are already in the basket you can see the presents that you can add to your cart before proceeding to checkout) 3. You click on the desired gift that one wishes to be added to the cart 4. It goes on to complete the purchase   We want to create these gift trigger on the basis of which sum to shop for, so the more you spend the more gifts you see for instance. We have 30 different gift items that we want to offer: Do you shop for 200kr (we must be able to choose the level limit on the sum for each level) you will see 10 of them. Shop then for 500kr you will see another 10, ie 20 and is one of 1000 sees all 30   We want to control the amounts that trigger, number of gifts that are available, eg 5, 10, or 20 ( slider fuction ) We want to redirect it to be a gift of $ 0 or if it is a super offer where they can purchase the item for 50kr, instead of 300kr as it normally costs. The point is that just because you have shopped for a certain sum, you get either a completely free and may add a little extra money.