Google Apps Script snippet to send tracking data to Google Analytics using the Measurement Protocol

gistfile1.js

function onOpen(){
  // example send for Sheets
  sendGAMP("UA-XXXX-1", SpreadsheetApp.getActiveSpreadsheet().getUrl());
  
  // example send for Documents
  //sendGAMP("UA-XXXX-1", DocumentApp.getActiveDocument().getUrl());
  
  // example send for Forms *NOTE* getUrl not implemented yet in New Sheets
  //sendGAMP("UA-XXXX-1", FormApp.getActiveForm().getUrl());
}

/*
* Example function for Google Analytics Measurement Protocol.
* @param {string} tid Tracking ID / Web Property ID
* @param {string} url Document location URL
*/
function sendGAMP(tid, url){
  var data = {'v': '1',
                 'tid': tid,
                 'cid': Utilities.getUuid(),
                 'z': Math.floor(Math.random()*10E7),
                 't':'pageview',
                 'dl': url };
  var payload = Object.keys(data).map(function(key) {
                                        return encodeURIComponent(key) + '=' + encodeURIComponent(data[key]);
                                    }).join('&');
  var options = {'method' : 'POST',
                 'payload' : payload };
  
  UrlFetchApp.fetch('http://www.google-analytics.com/collect', options); 
}

this approach needs to request permission from user otherwise its not working? how to ask for permission or how to make it work around?

for me the onOpen is not working anymore even if I authorize the script, maybe some security precautions in Google Apps Script? can you check?