How does Amazon gift card balance work?

Once applied to your Amazon account, the entire amount will be added to your gift card balance. Your gift card balance will be applied automatically to eligible orders during the checkout process and when using 1-Click. If you don’t want to use your gift card balance on your order, you can unselect it as a payment method in checkout.
For More Information Please Refer:
https://www.amazon.com/gp/help/customer/display.html?nodeId=201936940
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