Re: [w3c/payment-request] Add regionCode attribute (#690)

mnoorenberghe commented on this pull request.



> +            <li>If <var>details</var>["<a>regionCode</a>"] is present and not
+            the empty string:
+              <ol>
+                <li>Let <var>regionCode</var> be the result of <a>strip leading
+                and trailing ASCII whitespace</a> and <a data-cite=
+                "!INFRA#ascii-uppercase">ASCII uppercasing</a>
+                <var>details</var>["<a>regionCode</a>"].
+                </li>
+                <li>If <var>regionCode</var> is not a valid [[!ISO3166-2]]
+                subdivision code, throw a <a>RangeError</a> exception.
+                </li>
+                <li>Set <var>address</var>.<a>[[\regionCode]]</a> to
+                <var>regionCode</var>.
+                </li>
+              </ol>
+            </li>

> Presumedly, we can just grab the "en" column 2

I'm not quite sure how this all fits together but won't this affect what gets returned in the `region` property and therefore may be displayed back to the user on the payment confirmation page the merchant renders? If so, it would seem like we should use the language best for the user.

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