Re: [w3c/browser-payment-api] Payment app discovery (#155)

@adrianhopebailie,

> That's okay but I'd want us to state that the suggestions from the merchant SHOULD take preference 
over any from the browser, unless there is a good reason to not state that.

I understand the motivation for that suggestion. I am not sure I want to specify the presentation relationship between merchant-provided and browser-provided suggestions.

Here's a counter-proposal for the case where we enable merchant and browser recommendations:

 * The mediator must distinguish for user-installed payment apps, merchant suggestions,
   and user agent suggestions.
 
 * The mediator should maintain the order of merchant suggestions when making them
   available to the user.

I expect user agents will distinguish themselves by offering additional features such as:

 * Allowing the user to select a default payment app for a given domain, to make it easier to pay.
 * Allowing the user to easily store credentials in the browser when there are no registered
   payment apps.

We should not specify that sort of behavior.

> I think in general we SHOULD respect the order of things as provided by the payee. 

+1

Ian


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