To use a Visa gift card on Amazon, the card must be added as a standard credit or debit card payment method during checkout. First, ensure the Visa gift card is activated and you know its exact balance. Then, go to your Amazon account, navigate to "Your Payments," and add the Visa gift card details (card number, expiration date, and the name on the card, which can be "A Gift for You" or simply "Gift Card"). You will also need to enter a billing address, which can be your own address since gift cards do not have a specific billing address associated. Once the card is added, select it as the payment method at checkout to make a purchase. Amazon does not allow splitting payments between a Visa gift card and other payment methods for a single purchase, so the card balance should cover the order or be used carefully for partial payments by adding an Amazon e-gift card of the exact remaining balance after the Visa card is used.