The deal, however, comes with a bit of fine print: it doesn't apply to digital content like video games, Amazon gift cards, orders placed through Alexa or Amazon Prime Now, or any other mobile app that's not the main Amazon app, according to the official terms page. Oh, and you can only use the code once per account, so don't blow it on something stupid.
Sure, $50 is kind of a lot to spend to get a discount of less than $9, but if you were already going to buy $50 worth of stuff, then it's a nob-brainer. Or maybe a good opportunity to treat yourself with something extra. If anything, you might want to buy a $50 gift card from other retailers and get $8.62 of it for free. You have until 11:59pm PT to figure it out.