To redeem an eBay gift card, please follow these steps:

Visit the eBay website and sign in to your account.
Find the item(s) you want to purchase and add them to your cart.
Click Proceed to Checkout on the next screen, or click the cart icon in the top-right corner.
Scroll down to the Gift cards, coupons, and eBay bucks field and enter the 13-digit code on the back of your eBay gift card.
Click Apply to see your new total.
Check your details again and select Confirm and pay to complete the transaction.
Please note that if you dont have enough money on your gift card to cover the total cost of an item outright, you can pay the remaining cost using another payment method, such as a credit card, Apple Pay, Google Pay, or PayPal.