I am trying to get token from api and wanted to send each ajax call in jquery.

function fetchToken(){
      // duplicate backend call by `delay` returns a promise
      return new Promise(function (resolve, reject) {
        setTimeout(function () {
            resolve('test');
        }, 500);
    });
    }
function interceptAjaxCall(){
 var ajaxReference = $.ajax;
  $.ajax = function (options) {
      fetchToken()
      .then(function (tokenfrombackend) { 
          console.log(tokenfrombackend);
          var success = options.success;
          options.headers = { 'token':tokenfrombackend}; //this does not set token in each ajax call header!
          options.success = function (data, textStatus, jqXHR) {
          if (success)
              success(data, textStatus, jqXHR);
          };
         //return ajaxReference .apply($, arguments); /*returning here fails ajax call*/
      })
               
      return ajaxReference.apply($, arguments); 
    }

Intercepting each ajax is working but does not set token in each ajax header even after getting token value. Thanks in advance