There are several benefits to having an Amazon Gift Card, they enable you to buy products at your convenience from your online Amazon account & in Amazon stores. When you make a purchase online, the product is delivered to your doorstep or chosen drop-off point.
You have to sign into your Amazon and look for the tab that says "Gift Card and Top Up. Click on that tab and you will see Redeem an Amazon gift card. Click that link & enter the claim code into the box, the amount you have to spend will show below the box.
Once you have added your purchase to the checkout basket, click on the basket & follow the prompts to make a payment & receive your goods. Typically, Amazon will use the balance on your gift card first to make a payment. If this does not happen, simply click the Change Payment Method to use you gift care for payment.