✔ 最佳答案
Yeah, it'll deduct the price from the giftcard first and then use your debit card. Just make sure you put the Amazon card in first and have the $5 in your account. Go to your account page on Amazon and there's an option for applying a gift card to your account. Doing that will deposit the funds so you can use them.
Keep in mind that stuff like promotional credit for Amazon MP3 or something is separate from regular giftcard credit and it will say so when you add the code (although Amazon MP3 gift cards you buy in stores work for everything).