Inheritance: implements Ipunkt\LaravelAnalytics\Contracts\TrackingBagInterface
 /**
  * returns the javascript embedding code
  *
  * @return string
  */
 public function render()
 {
     $script[] = $this->_getJavascriptTemplateBlockBegin();
     $trackingUserId = null === $this->userId ? '' : sprintf(", {'userId': '%s'}", $this->userId);
     if ($this->debug || App::environment('local')) {
         $script[] = "ga('create', '{$this->trackingId}', { 'cookieDomain': 'none' }{$trackingUserId});";
     } else {
         $script[] = "ga('create', '{$this->trackingId}', '{$this->trackingDomain}'{$trackingUserId});";
     }
     if ($this->ecommerceTracking) {
         $script[] = "ga('require', 'ecommerce');";
     }
     if ($this->displayFeatures) {
         $script[] = "ga('require', 'displayfeatures');";
     }
     if ($this->anonymizeIp) {
         $script[] = "ga('set', 'anonymizeIp', true);";
     }
     if ($this->nonInteraction) {
         $script[] = "ga('set', 'nonInteraction', true);";
     }
     if ($this->campaign instanceof Campaign) {
         $script[] = (new CampaignRenderer($this->campaign))->render();
     }
     $trackingStack = $this->trackingBag->get();
     if (count($trackingStack)) {
         $script[] = implode("\n", $trackingStack);
     }
     if ($this->autoTrack) {
         $script[] = "ga('send', 'pageview');";
     }
     if ($this->ecommerceTracking) {
         $script[] = "ga('ecommerce:send');";
     }
     $script[] = $this->_getJavascriptTemplateBlockEnd();
     return implode('', $script);
 }