src/fakePage.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
</head>

<body>
    <div class="turnstile"></div>
    <script src="https://challenges.cloudflare.com/turnstile/v0/api.js?onload=onloadTurnstileCallback" defer></script>
    <script>
        window.onloadTurnstileCallback = function () {
            turnstile.render('.turnstile', {
                sitekey: '<site-key>',
                callback: function (token) {
                    var c = document.createElement('input');
                    c.type = 'hidden';
                    c.name = 'cf-response';
                    c.value = token;
                    document.body.appendChild(c);
                },
            });
        };

    </script>
</body>

</html>