Re: [w3c/payment-request] Add support for merchant validation (#751)

marcoscaceres commented on this pull request.



> +            <li>Let <var>request</var> be <var>event</var>.<a data-lt=
+            "MVE.[[request]]">[[\request]]</a>.
+            </li>
+            <li>If <var>request</var>.<a>[[\state]]</a> is not
+            "<a>interactive</a>", then <a>throw</a> an
+            "<a>InvalidStateError</a>" <a>DOMException</a>.
+            </li>
+            <li>If <var>request</var>.<a>[[\updating]]</a> is true, then
+            <a>throw</a> an "<a>InvalidStateError</a>" <a>DOMException</a>.
+            </li>
+            <li>Set <var>event</var>'s <a>stop propagation flag</a> and <a>stop
+            immediate propagation flag</a>.
+            </li>
+            <li>Set <var>event</var>.<a>[[\waitForUpdate]]</a> to true.
+            </li>
+            <li>Run the <a>validate a merchant algorithm</a> with

Oh crap. I went all circular (how embarrassing!)... this was supposed to:

 1.  disable the UI. 
 2. wait for wait for the promise to settle, "abort the update" is it rejects... 
 3. if it fulfills, then `value` needs to be cryptographically verified. 
 4. if it's the merchant is no good, abort the update.
 5. if merchant is validated, enable the UI.  


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