Re: [w3c/payment-handler] Open Window Algorithm and tracking through 1ps (#351)

Hi @snyderp,

Thanks for raising an issue. 

One quick note: the merchant does not open the payment handler. The user chooses
(and launches) a payment handler to respond to a payment request. Once the payment handler is running, the merchant and payment handler can interact through a small set of events defined in Payment Request API and Payment Handler API. 

I have a couple of questions:

* Today users are often redirected to payment services, which also seem to be top-level contexts. Our thinking is that this is analogous to that, except a better user experience through a modal window. Does your comment about 3p context also apply to those sorts of redirects?

* Payment services know to whom I am making a payment. When you refer to tracking users, do you have in mind tracking beyond that knowledge of who is the beneficiary?

Thanks!

Ian







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