text: (function() {
     document.addEventListener("DOMContentLoaded", function () {
         let select = document.getElementById("mollie_select_zones");
         let hidden = document.getElementById("mollie_selected_zones");
         select.addEventListener("change", function () {
             let options = select.options;
             let selectedZones = "";
             for (let i = 0; i < options.length; i++) {
                 if (options[i].selected) {
                     selectedZones += options[i].value + ",";
                 }
             }
  
             hidden.value = selectedZones;
         })
  
     });
  })();