X-Callback: how to use?

#1

HI again, I‘ve to many habits, maybe. But I‘d like to do the work of tracking only once, so I want to connect apple Health with Habitify. I understand that this is working by using the callback ID present in every habit entry. I would define an automation in siri shortcuts, formerly workflow. But how? I cannot find any documentation here. There is only one ID per habit, is it called upon start and end of a workout for example? Lets assume I want to connect yoga trainings with habitfy, so any yoga session I start (and end) should be registered with the corresponding habit in our app. How to code the automation?
How is the x-callback scheme with habitfy?
Help is very much appreciated!

#2

btw the more info button on x-callback opens an error page “net found” (german version).