I have been trying to set up a custom activity in Journey Builder but I am not able to reach the point where the custom event icon becomes available in the journey builder interface. In other words, there is nothing to drag and drop into the journey.
I am not trying to do anything fancy, just the most basic example where I can post something to requestb.in to see how it all works and pave the way for the more sophisticated use-cases.
In terms of the set up in AppCenter, I based myself on this walkthrough from GitHub.
Files and their structure were based on the official SlaesForce documentation available here.
All of this only got me as far as being able to see my test package as an installed package in Marketing Cloud. This installed package, however, seems to be completely empty if I click on it, so in a way I am not surprised that the custom event is not avaliable in Journey Builder
Anyone has an idea what I am still missing here?