From https://stripe.com/blog/stripe-checkout:
It’s unfortunate that everyone has to reinvent the wheel when the time comes to implement a payments UI. We decided to build something that you can just drop in as a single tag
The script tag creates a “buy” button on your page. Clicking the button pops a modal payment form where the customer submits their info directly to stripe. It’s a literally a 30 second integration. But here’s the kicker: