See also: IRC log
https://lists.w3.org/Archives/Public/public-payments-wg/2017Jul/0004.html
Andre: I will ping Jason to make progress
IJ: Any comments today?
Alyver: I agree we should
revisit.
... I will review it as well.
IJ: We may want to take this to the broader WG.
IJ: Can we close this? Let's keep this on the agenda.
https://github.com/w3c/payment-handler/pulls
https://github.com/w3c/payment-handler/pull/170
https://w3c.github.io/browser-payment-api/#canmakepayment()-method
"If methodData.supportedMethods is a supported payment method identifier (including its payment method specific capabilities), resolve promise with true, and abort this algorithm. "
https://github.com/w3c/payment-handler/pull/170/files
https://github.com/w3c/payment-handler/pull/170#issuecomment-306921215
Proposed: 18 July