Re: [w3c/payment-request] Extensibility of PaymentResponse.complete(result) (#817)

> Would be interesting to explore the possibility of having an IDL definition in the manifest for payment methods that use a URL identifier?

Would be nice. The challenge is that browser today can only use IDL statically: we literally take IDL as text input, run it through a Python-based processor, and spit out C++... which is then compiled into the browser itself (i.e., no way of doing some kind of JIT compilation today).

So, before we start going too deep into technical solution, I think we should be clear about we might need to support SRC and other things. 

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