Fetch a value via HTTP request and store it to Composer localstorage

fetch.js

var getScript = function (src, callback) {
    var el = document.createElement('script');
    el.type = 'text/javascript';
    el.async = false;
    el.src = src;
    /**
     * Ensures callbacks work on older browsers by continuously
     * checking the readyState of the request. This is defined once
     * and reused on subsequeent calls to getScript.
     *
     * @param  {Element}   el      script element
     * @param  {Function} callback onload callback
     */
    getScript.ieCallback = getScript.ieCallback || function (el, callback) {
        if (el.readyState === 'loaded' || el.readyState === 'complete') {
            callback();
        } else {
            setTimeout(function () { getScript.ieCallback(el, callback); }, 100);
        }
    };
    if (typeof callback === 'function') {
        if (typeof el.addEventListener !== 'undefined') {
            el.addEventListener('load', callback, false);
        } else {
            el.onreadystatechange = function () {
                el.onreadystatechange = null;
                getScript.ieCallback(el, callback);
            };
        }
    }
    // This is defined once and reused on subsequeent calls to getScript
    getScript.firstScriptEl = getScript.firstScriptEl || document.getElementsByTagName('script')[0];
    getScript.firstScriptEl.parentNode.insertBefore(el, getScript.firstScriptEl);
};

getScript('https://code.jquery.com/jquery-2.2.3.min.js', function() {

    var opts = {
      type: 'GET',
      url: 'https://rest-api.appgyver.com/example_api/564080a976aff7bfc5e30042',
      contentType: false,
      processData: false,
      crossDomain: true,
      success: function(data) {
          if (data) {
            supersonic.data.storage.property("fetched-customer").set(data.company);
          }
      },
      error: function(error) {
            console.log(error, error.error)
        }
    }

    $.ajax(opts);
});