You can use the following code to disable push notifications for your customers.


<script>
window.fcWidgetMessengerConfig = {        

config: {
          
               disableNotifications: true


          }
}
</script>
<script src='//fw-cdn.com/1*****7/2*****4.js' chat='true'></script> 


Note: Navigate to Admin Settings > CRM Tracking Code > Integrate your website > Copy to get the widget code.