diff --git a/testing/web-platform/tests/payment-request/PaymentAddress/attributes-and-toJSON-method-manual.https.html b/testing/web-platform/tests/payment-request/PaymentAddress/attributes-and-toJSON-method-manual.https.html
index edde533be6b2..45f3f0a5672c 100644
--- a/testing/web-platform/tests/payment-request/PaymentAddress/attributes-and-toJSON-method-manual.https.html
+++ b/testing/web-platform/tests/payment-request/PaymentAddress/attributes-and-toJSON-method-manual.https.html
@@ -68,7 +68,6 @@ function runManualTest(button, expected = {}) {
     <button onclick="
     const expectedAddress = {
       country: 'AU',
-      regionCode: 'QLD',
       addressLine: '55 test st',
       city: 'Chapel Hill',
       dependentLocality: '',
diff --git a/testing/web-platform/tests/payment-request/PaymentValidationErrors/retry-shows-shippingAddress-member-manual.https.html b/testing/web-platform/tests/payment-request/PaymentValidationErrors/retry-shows-shippingAddress-member-manual.https.html
index 356f30da6b54..c3e2ba713223 100644
--- a/testing/web-platform/tests/payment-request/PaymentValidationErrors/retry-shows-shippingAddress-member-manual.https.html
+++ b/testing/web-platform/tests/payment-request/PaymentValidationErrors/retry-shows-shippingAddress-member-manual.https.html
@@ -81,11 +81,6 @@ function retryShowsShippingAddressMember(button, error) {
       The payment sheet shows "REGION ERROR" for the shipping address' region.
     </button>
   </li>
-  <li>
-    <button onclick="retryShowsShippingAddressMember(this, { regionCode: 'REGIONCODE ERROR' });">
-      The payment sheet shows "REGIONCODE ERROR" for the shipping address' region code.
-    </button>
-  </li>
   <li>
     <button onclick="retryShowsShippingAddressMember(this, { sortingCode: 'SORTINGCODE ERROR' });">
       The payment sheet shows "SORTINGCODE ERROR" for the shipping address' sorting code.
diff --git a/testing/web-platform/tests/payment-request/historical.https.html b/testing/web-platform/tests/payment-request/historical.https.html
index cbd29d4cff86..e681f6486b9b 100644
--- a/testing/web-platform/tests/payment-request/historical.https.html
+++ b/testing/web-platform/tests/payment-request/historical.https.html
@@ -21,6 +21,9 @@
 
   // https://github.com/w3c/payment-request/pull/765
   ["languageCode", "PaymentAddress"],
+
+  // https://github.com/w3c/payment-request/pull/823
+  ["regionCode", "PaymentAddress"],
 ].forEach(([member, interf]) => {
   test(() => {
     assert_false(member in window[interf].prototype);