Use the Kindle device to read e-books purchased from Amazon. When you have a gift card account credit, Amazon applies it to your Kindle purchases before deducting money from your credit or debit card. You can easily check your Amazon account credit.
How do I know if I have a Kindle credit?
Click on “Add gift card or promotion code”. A box will then pop up showing you how much money you have in Amazon gift cards and Amazon Music (click here to see how I earn Amazon gift cards for free). The Amazon Music amount is your Kindle credit balance, which can be used on everything listed above.
How does Amazon ebook credit work?
In order to buy books for your Kindle, you must set up your Amazon account to process payments from your credit or debit card, as well as from gift cards. When you have a gift card account credit, Amazon applies it to your Kindle purchases before deducting money from your credit or debit card.