In a shopping cart, items can have a discount, but if a users asks for an express delivery on a specific item, the discount will change. I need to make them aware of that.
1 item = 1 line. The promotion is displayed on the line and the user can use a checkbox at the end of the line to tell if he wants an express delivery on the item (see mockup below).
The solution I thought of would be to display a pop-up window when the user select the "express" checkbox to tell him the promotion will change. To avoid having a pop-up all the time, a "don't show me this again" checkbox would be available but will it be clicked ?