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@@ -221,7 +221,16 @@ <h3 id="network">Network Failures</h3>
 	    </ul>
 	  </li>
 	</ul>
+
+	<p>See Working Group discussion of <a href="https://github.com/w3c/browser-payment-api/issues/287">transaction identifiers</a>.</p>
       </section>
+
+      <section>
+	<h3 id="versionin">Versioning</h3>
+	<p>We anticipate that payment methods will change over time. The Working Group anticipates that the ecosystem will use different payment method identifiers to distinguish versions. A merchant that accepts multiple versions of a payment method can supply multiple identifiers.</p>
+      </section>
+
+      
     </section>