Stripe is using this, and it's great. There's a few gaps in terms of messaging and flexibility (notably, which type of payment request is being sent -- apple pay, google pay etc.) but it makes it much, much more developer friendly.
Can someone expand on how Stripe is using this, how it affects integration and the end user experience?
If you have a saved credit card in your browser or apple/Google pay on your phone, it will work.
Demo describes it better: