Express theme

<script> 
      window.addEventListener('load', () => {
             var pfATCs = $('#__pf').find('[data-pf-type="ProductATC"]');
            pfATCs.click(e => {
                var checkoutAction = e.currentTarget.getAttribute('data-checkout');
                if (checkoutAction === 'same') {
                window.__pagefly_helper_store__ && window.__pagefly_helper_store__.subscribe(function(res) {
                var id = res.id;
                window.carts.forEach(function (e) {
                    e.onCartUpdated(id);
                });
            })
		}
        })                 
          })
  </script>