Press the button to make a test payment. It won't actually charge you!
You can enter fake details. Here are some example card numbers.
Success! We simulated the payment 😉
Aw, unable to complete the payment simulation! 😫
Sorry your browser does not appear to support the Payment Request API.
Normally we would practise progressive enhancement and use another payment UI here, but this is just a Payment Request demonstration!
For more information, see the README and the blog post.