Re: [browser-payment-api] How are web-based payment apps supported? (#39)

While I can understand that the integration between user agents and native payment apps is a complex issue (see #50) I believe that we should have some minimum conformance criteria for user agents and web based payment apps.

This could be as simple as mandating that the payment request is submitted to the app URL via a POST. 

We could define two standard response types:

 1. HTML - in which case the user agent renders the HTML (the app UI)
 1. Some other type that indicates to the user agent that the app is not web based but provides some signal that enables the user agent to invoke the native app.

I need to flesh this idea out a little more :smile: 

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