Cart added, but no sales? Clients adding carts but not purchasing? Increase sales by displaying the customer area on the cart page where discount codes can be entered. Do you offer coupons along with your marketing plan to maximize your marketing efforts? If consumers cannot add a coupon to their cart, what should they do? By stacking discounts, multiple discounts can be applied to a single order. Take 10% off jeans and 5% off shoes.