Re: [w3c/browser-payment-api] How are payment apps shared between different browser brands? (#38)

@mattsaxon 

> I'm suggesting that user-agent and mediator in the architecture are different actors and we should define an interface between them.

I would state this differently. User agent and mediator are different roles and may be different actors depending on the deployment scenario. I think that in the traditional web browser scenario that the user agent and mediator will be the same actor and we don't need to define an interface between them.

That is not to say that browsers may not provide an extension point to allow users to use a different external mediator however I don't think we can mandate this in the spec any more than we can mandate that browsers allow any other extension.

I'd like the HTTP interfaces to be defined for both mediators and apps and then if a browser offered the ability to configure an external mediator they'd likely use the HTTP interface.

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