Re: [w3c/webpayments] [Payment Request] Should we allow a "polling" mechanism for websites to not invoke the API if there are no enabled methods (#159)

I think a polling mechanism is a good idea, but the browser needs to get the user's consent before handing this information over to the merchant (just like when asking permission for a web site to use the location api for instance).

This means that when the merchant calls the polling function, a dialog will be displayed saying something like "The website 'abcmerchant.com' wants to access your payment apps. Allow / Deny".

I'm not sure whether this should be a permission to use the entire payments api, or just the polling function. A permission for the entire payments api might be the better choice.

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