[w3c/webpayments-payment-apps-api] What is the process for rendering the payment app UI (#4)

Question raised at London f2f and migrated from: https://github.com/w3c/webpayments/issues/162

When the payment app requires UI it provides a URL that must be fetched to render UI.

WebRTC does this by rejecting the original calling page's promise with a URL which is rendered.
This seems like a problem (asking the merchant to render the app).

Better option may be a simple `window.open()` from the payment app javascript code.


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