chromium/chrome/test/data/capability_delegation/payment_request_delegation_sub.html

<!DOCTYPE html>
<!--
Copyright 2021 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Payment request delegation child frame</title>
</head>
<script>
  async function tryPaymentRequestAndReport(event) {
      const request = new PaymentRequest([{
          supportedMethods: event.data,
      }], {
          total: {
              label: "total",
              amount: { currency: "CAD", value: "1.00" }
          }
      });

      request.show().catch(exception => {
          parent.postMessage(exception.name, {targetOrigin: "*"});
      });

      // When show() is not allowed, the Promise above throws a "NotAllowedError"
      // right away.  Otherwise, the visible dialog is aborted after a short delay
      // below, which causes the Promise above to throw an "AbortError".
      window.setTimeout(() => request.abort().catch(()=>{}), 50);
  }

  window.addEventListener("message", tryPaymentRequestAndReport);
</script>
</html>