HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasRedemptionRecord pair</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <button id="btn" type="button">Snapshot both APIs</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", async function () {
      var issuer = "https://issuer.example";
      var out = {
        isSecureContext: window.isSecureContext,
        hasPrivateToken: "unsupported",
        hasRedemptionRecord: "unsupported"
      };
      try {
        if (typeof document.hasPrivateToken === "function") {
          out.hasPrivateToken = await document.hasPrivateToken(issuer);
        }
        if (typeof document.hasRedemptionRecord === "function") {
          out.hasRedemptionRecord = await document.hasRedemptionRecord(issuer);
        }
      } catch (err) {
        out.error = err.name + ": " + err.message;
      }
      document.getElementById("out").textContent = JSON.stringify(out, null, 2);
    });
  </script>
</body>
</html>

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Document.hasRedemptionRecord — pair with hasPrivateToken (Try It)