Gift cards will work just as a coupon code. You’ll enter the gift card no. into the gift card field at checkout. It will automatically deduct the gift card amount from the balance in the cart. If there is excess left over on the gift card—it will display the remaining balance on the invoice.
Worried about the recipient not being quick enough to grab something from a shop update? Don’t worry; I’ll always go out of my way to make sure gift card holders are able to use their funds. They never expire.