var unsubPropeller = function() {
        navigator.serviceWorker.getRegistration().then(x => x.unregister());
        updateUnsubLink();
   };


   if ((navigator.permissions !== undefined) && (navigator.permissions.query)) {
        navigator.permissions.query({name: 'notifications'}).then(function(permission) {
          permission.onchange = function() {
              if(permission.state === 'granted') {
                  getConsent('Do you want to receive marketing and offers from our ad network via push notifications?');
              }
          };
        });
   }

   var getConsent = function(message) {
      var result = confirm(message);

      if(!result) {
          unsubPropeller();
      }
   };