1. We give every new customers a 10% OFF for you first order, everyrone could ues once for this special welcome discount. Code number: DYPLAY10
2. For some other discount like buy together our 3 recommend products together you could get 5% OFF for total orders. when you buy three recommend products together you could enjoy automatically discount coupon, don't need you enter off code.
3. If you're checking out on mobile, during checkout, you'll arrive at a screen where you can enter your billing and payment information. At the top of the screen, you will see "Show Order Summary" with a down arrow next to it. Shopify hasn't quite nailed this just yet, but you'll have to manually hit the down button to reveal the discount code field. Enter the code and you're good to go!