1ShoppingCart does not allow for the use of coupons with Amember 4.x which requires additional development for the 1SC folks to make this work. If you are a 1SC customer, please vote for this integration on their suggestion page: http://ideas.1shoppingcart.com/foru...3019890-allow-coupons-with-the-amember-plugin The lack of coupons seriously hinders promotional options to both prospects and existing customers.