Payment Request API

 Payment Request API  is a W3C specification for collecting payment information (credit card, billing address, etc) by the browser, to help streamline the payment process on a web page.

Aaron Parecki
added support for the Payment Request API to his website during IndieWebCamp Austin 2017 using the Stripe integration.
 * https://aaronparecki.com/2017/12/10/8/payment-request

Documentation
Various browsers and payment handlers that support Payment Request API all have their own documentation:

Browsers: https://caniuse.com/payment-request
 * Google Chrome: https://developers.google.com/web/fundamentals/payments/
 * Bringing Easy and Fast Checkout with Payment Request API
 * Deep Dive into the Payment Request API
 * Microsoft Edge: 2017-05-24: Payment Request API
 * MSDN: Payment Request API samples
 * blog post: 2016-12-15: Simpler web payments: Introducing the Payment Request API
 * Firefox status: https://platform-status.mozilla.org/#payment-request

(need screenshots of the UI flow on browsers that supposedly support this, e.g.)
 * (screenshot initial setup, is user prompted to enter a cc? or do they have to set it up in prefs before attempting to pay via Request Payment support?)
 * (screenshot of request payment provider picker / confirmation)
 * etc.

Providers:
 * Stripe: https://stripe.com/docs/payment-request-api