Shopify

<script>
(function () {
  try {
    var KEY = 'sendy_sc', RE = /^[A-Za-z0-9_-]{1,64}$/;
    var q = new URLSearchParams(window.location.search).get('sc');
    if (q && RE.test(q)) {
      try { localStorage.setItem(KEY, q); } catch (e) {}
      document.cookie = KEY + '=' + q + ';path=/;max-age=864000;SameSite=Lax;Secure';
    }
    function readSc() {
      try { var v = localStorage.getItem(KEY); if (v && RE.test(v)) return v; } catch (e) {}
      var parts = document.cookie ? document.cookie.split('; ') : [];
      for (var i = 0; i < parts.length; i++) {
        if (parts[i].indexOf(KEY + '=') === 0) return decodeURIComponent(parts[i].slice(KEY.length + 1));
      }
      return null;
    }
    function pushToCart() {
      var v = readSc();
      if (!v) return;
      fetch('/cart/update.js', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ attributes: { sc: v } })
      }).catch(function () {});
    }
    pushToCart();
    document.addEventListener('submit', function (e) {
      var f = e.target;
      if (f && f.action && String(f.action).indexOf('/cart/add') !== -1) setTimeout(pushToCart, 500);
    }, true);
  } catch (e) {}
})();
</script>