Re: [w3c/browser-payment-api] What is the extensibility mechanism for the payment request and response messages? (#146)

@adrianhopebailie wrote:
> As this is a browser API we need to define the basic structure of the request in WebIDL which is not extensible so we will not have an easy way to allow extensions of that entire message.

That's not accurate at all. We have a proposal that demonstrates that not only is it easy to define a basic message format and express it in WebIDL, but it's also easy to enable extensions of entire payments messages while also providing strict validation and conformance rules (if we want to do that):

http://manu.sporny.org/tmp/wpwg/webpayments/proposals/core-messages/

and a pending pull request for this mechanism:

https://github.com/w3c/webpayments/pull/119

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