Re: [w3c/browser-payment-api] "User accepts the payment request algorithm" needs to clarify where Payment Handlers are invoked (#476)

Hi @mattsaxonwp,

The spec has been edited and the section numbers may no longer be accurate (e.g., I think 17.4 used to be 19.4).  I can't find your "section 7.4"

In reading the text of what is now 17.4, it seems to me that as written, the mediator is full responsible. One question is "where does the mediator get the data to do the things listed in 17.4?"

In the case of Web-based payment apps, we are defining a PaymentAppResponse [1]. The user agent will use it as the source of some of the information identified in 17.4 (e.g., methodName and details). 

Perhaps one way to address your comment is to add a note after the 17.4 algorithm, something like:
 
  "Note: methodName and details are provided by the user agent or other payment app."

Ian

[1] https://w3c.github.io/webpayments-payment-apps-api/#sec-payment-app-response

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