Re: [webpayments] Abstract payment architecture (#11)

Regarding: https://github.com/w3c/webpayments/wiki/All-in-the-Browser

If we're considering "installing" Payment Apps as ServiceWorkers (or something similar), we should consider how to handle the case that a new browser or device is being used. If a payer's Payment Apps can be discovered via some external service, then a discovery request could be issued that results in Payment App manifests. Those manifests could include a URL that could be used to perform the installation on demand.

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https://github.com/w3c/webpayments/issues/11#issuecomment-157417878