Affiliate Marketing Secrets

I saw that an online retail website I frequent has added the Amazon Checkout option when checking out. This site is not affiliated with Amazon.
If you choose to check out using the Amazon Checkout option, a small pop-up window opens, asks you to log into your your Amazon account, and then takes you to what seems to be the final step in the checkout process (choosing payment options, shipping options, shipping address, etc.).
I would like to know if this feature allows you to use an existing Amazon gift card balance that was applied to your account prior to you using the Amazon Checkout feature on the 3rd party site.
For example, let’s say I got an Amazon gift card for $50. I then applied that card to my Amazon account and so, my Amazon gift card balance (on my account) becomes $50. I then go to a 3rd party site that had the Amazon Checkout feature, purchase something, and use the Amazon Checkout feature. Will I be able to use my gift card balance of $50 towards my purchase?