@Dmitriy OK, somehow the example/widget is still messed up??
As per this topic
Putting in /pin/ into the Widget still gives error on either Cloud or Local Server…
…and I have not yet been able to get it to work as advertised.
But if you put the URL directly in the Webhook Widget, it will work…
Clearly only a one shot setup if requiring manual pasting URL each time 
What are we missing here?