src/index.html

<!DOCTYPE html>
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<head>
  <meta charset="utf-8" />
  <title>Web Play Billing Sample Application</title>

  <!-- Origin Trial -->
  <meta http-equiv="origin-trial" content="$ORIGIN_TRIAL_TOKEN" />

  <!-- Make the website responsive via a viewport tag -->
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />

  <script>
    // Check that service workers are supported
    if ('serviceWorker' in navigator) {
      // Use the window load event to keep the page load performant
      window.addEventListener('load', () => {
        navigator.serviceWorker.register('/service-worker.js');
      });
    }
  </script>

  <!-- The Material Web Components use standard JavaScript modules. -->
  <script type="module" src="/js/index.js"></script>

  <link rel="manifest" href="/manifest.json" />

  <link href="/css/main.css" rel="stylesheet" />

  <link rel="preconnect" href="https://fonts.gstatic.com/" crossorigin />
  <link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500" rel="stylesheet" />
  <link
    href="https://fonts.googleapis.com/css?family=Material+Icons&display=block"
    rel="stylesheet"
  />
</head>
<body>
  <app-bar id="app-bar" title="Web Play Billing Sample App"></app-bar>
  <div id="content-container">
    <coin-dialog id="coin-dialog">
      <theme-picker slot="theme" id="theme-picker"></theme-picker>
    </coin-dialog>
    <h1>Welcome to Web Play Billing Sample App</h1>
    <p>This is a sample application using Google Play Billing in a TWA.</p>
    <div>
      <h1>Available items to purchase:</h1>
      <sku-list id="items-to-buy"></sku-list>
    </div>
  </div>
  <p class="debug" id="debug-btn">Debug Logs</p>
  <mwc-dialog heading="Debug Logs" id="debug-box">
    <pre id="log-box"></pre>
  </mwc-dialog>
  <mwc-snackbar id="notification" labelText="Hello, I am a notification"> </mwc-snackbar>
</body>