Coupons are issued by suppliers and every supplier has to give you a code in order to apply the coupon. Suppliers on Industry Deals usually use coupons for volume discounts. It is also recommended that you discuss volume discount options with your supplier.
Coupons only work on the issued supplier’s products and offers, and every product has a unique coupon code. You may need to know the coupon application policy of your supplier.
In order to apply a coupon, you need to checkout with the product you want to buy and, in Your Cart Checkout, enter your coupon code and click on Apply Coupon. This will show you the total price for your order after discounting. You may need to read How to find out product prices and Why should I contact the supplier before making any purchases.