Adding a Visa gift card on Amazon isn't the process that you'd expect, though. While it is technically a gift card, it can't be registered as a gift card like an official Amazon gift card would.

Find out if you can buy gift cards with a credit card, the rules, potential fees, and tips to maximize rewards while avoiding extra costs. ... Financial institutions such as Visa, ...

Click on Buy Now and use the Visa gift card as the payment method. If you’re on mobile, tap on the three-line menu button, then go into Account > Manage gift card balance > Reload Your Balance.