Re: [w3ctag/spec-reviews] Web Payments Working Group Specifications (#152)

Hi @dbaron,

Thank you for the careful review. I can fill in a couple of blanks:

1) Payment method identifiers that are URLs will point to Payment Method Manifest Files.
    We are working on a separate specification for those. Our current draft of that spec
    is out of date with respect to "version 2" that we recently discussed at our face-to-face
    meeting:
       https://github.com/zkoch/zkoch.github.io/blob/master/pmi-v2.md

2) The system as a whole intends to support:
     a) Arbitrary payment methods, identified by URLs and described by payment
         method manifest files.
     b) Third party payment apps that register their support for different payment
          methods with the browser. The WG is developing the Payment Handler API [1] 
          to that Web apps can request permission from the user to handle
          payment request events for different payment methods. Thus, the ecosystem
          will support both Web-based payment apps (through an open standard)
          and native payment apps (through proprietary APIs).

Ian

[1] https://w3c.github.io/webpayments-payment-apps-api/

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