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diff --git a/testing/web-platform/tests/payment-request/show-method-postmessage-manual.https.html b/testing/web-platform/tests/payment-request/show-method-postmessage-manual.https.html
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index 0000000000..0751920e37
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+++ b/testing/web-platform/tests/payment-request/show-method-postmessage-manual.https.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Test for PaymentRequest.show() method</title>
+<link rel="help" href="https://w3c.github.io/browser-payment-api/#show-method">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+"use strict";
+setup({
+  explicit_done: true,
+  explicit_timeout: true,
+  allow_uncaught_exception: true,
+});
+
+async function runUserActivation(button) {
+  button.disabled = true;
+  const { contentWindow: iframeWindow } = document.getElementById("iframe");
+  const expectedId = "pass123";
+  await Promise.resolve(); // next tick
+  const promiseForResponse = new Promise(resolve => {
+    window.onmessage = ({ data: { requestId } }) => resolve(requestId);
+  });
+  const ops = { id: expectedId, request: "show-payment-request" };
+  iframeWindow.postMessage(ops, window.location.origin);
+  promise_test(async () => {
+    const actualId = await promiseForResponse;
+    assert_equals(actualId, expectedId, "ids must match");
+  }, button.textContent.trim());
+  done();
+}
+
+</script>
+<h2>Test PaymentRequest.show() triggered by user activation using postMessage()</h2>
+<p>
+  Tests that user activation works over postMessage().
+</p>
+<p>
+  Click on bottom below. Hit "Pay".
+</p>
+<ol>
+  <li>
+    <button onclick="runUserActivation(this)">
+      show() is triggered by user activation passed through postMessage() and a promise
+    </button>
+  </li>
+</ol>
+<iframe width="100%" id="iframe" src="show-method-postmessage-iframe.html" allow="payment"></iframe>
+<p>
+  <small>
+    If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
+    and tag one of the <a href="https://github.com/web-platform-tests/wpt/blob/master/payment-request/META.yml">suggested reviewers</a>.
+  </small>
+</p>