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So I started doing some research. I found a company which developed a browser extension to support payments on amazon with bitcoins...
I don't know what app you're talking about, but back in 2018, Moon launched BTC payments via the Lightning Network on Amazon. Now you can use any wallet with Lightning support for the Chrome browser via the Moon extension:
https://paywithmoon.com/ You can read more information in the developer blog:
https://blog.lightning.engineering/posts/2019/03/20/loop.html