Navigate to the Sales > Gift Cards page

Click the New Gift Card button at the top right corner of the page

Enter or generate a Gift Card Number 

Enter a Gift Card Amount

Click the Create Gift Card button

Enter the gift card number in the Enter Gift Card Number input field in the shopping cart

Select Apply. The balance of the Gift Card will be applied to the Order up to the full amount of the Order Total

After a Gift Card is used it's balance is updated

Gift Cards can be used on multiple transactions until the balance is $0