Re: [w3c/browser-payment-api] Should we standardise a callback mechanism for payment apps to communicate to 3rd parties? (#109)

There is plenty you can do in the existing model, so I'm not exactly sure if a richer dialog is necessary.  I have not paid a close enough attention to the use cases probably.

In any case, browser vendors have already abandoned older more permissive extensions frameworks like XUL to standardize on WebExtensions, which specifically disallows this for extensions.  It's more complex anytime you poke holes in someone security model. 

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