Enter your gift card code in the voucher field in the checkout.
In the checkout, you’ll see how much money is available on your gift card.
If your total exceeds the gift card amount, the full value will be used and the gift card is maxed out.
If your total is less than the gift card amount, there will be money left on the card and you can use it again at a later date.
You can also choose to not use your gift card as payment even after entering the code. Just press the x at the end of your code.