Here is a simple webhook QD. The idea is that instead of having external apps continuously polling the HC3 for events, the app makes a call to the HC3 and register it's url for callbacks. The HC3 will POST all events to the apps that have registered with it. If an app doesn't answer to the POST it's just unregistered.  If an app register twice it's detected and won't cause a duplicate post. Thus, a strategy for apps could be to re-register at intervals in case the HC3 QuickAp