If you purchase more than one product using a combination of Gift Card or Credit balance and card payment, the Gift Card or Credit balance is applied across all products in your order. It works so that the same portion of each product is paid for by the Gift Voucher of Credit balance, with the remainder being paid for by the card payment. If you then request a refund or part of your order, you will receive the relevant portion back to your Gift Card or Credit balance and to the card that you paid with.