Re: [w3c/webpayments-payment-apps-api] Extending invocation of payment apps with other techniques than HTTP (#10)

@adrianhopebailie: Is there any more information available on this proposed solution? I would be interested in trying to implement a proof-of-concept, but all I have to go on is this:

> At registration the payment app provides a URL for some javascript which listens for post message events that contain the payment request method.

Having a javascript file that is installed into the browser to handle requests, sounds very similar to service workers -- perhaps it would be a good idea for payment apps to re-use concepts and api design from the [service workers api](https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API)?

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