[Solved] Hierarchy to requested slots in FormAction

Okay, so for anyone interested:

The stuff I was looking for is called conditional slot logic:

Slot Filling

Here’s what I did (hope it’s not gonna crash at some random point):

def required_slots(tracker: Tracker) -> List[Text]:
        """A list of required slots that the form has to fill"""
        if (tracker.get_slot('email')!= None) & (tracker.get_slot('userid')!= None):
            return ["email", "userid", "isconfirmed"] 
        else:
           return ["email", "userid"]