Voucher Calculator UI Design & User Flow

Here is a shot from one of my current UI design solution for a complicated voucher calculation. Users needed to be briefly informed regarding which voucher give them what kind of offer, and I came up with a form of a receipt and added all the information into the "Shopping Cart" to get rid off taking too much time from users to read the campaign details by clicking on each voucher and created an action to push them into checking out.