def invoke_webhook_handlers(self):
        """
        Invokes any webhook handlers that have been registered for this event
        based on event type or event sub-type.

        See event handlers registered in the ``djstripe.event_handlers`` module
        (or handlers registered in djstripe plugins or contrib packages).
        """
        signal = WEBHOOK_SIGNALS.get(self.type)

        if signal:
            return signal.send(sender=Event, event=self)

        Invokes any webhook handlers that have been registered for this event
        based on event type or event sub-type.

        See event handlers registered in the ``djstripe.event_handlers`` module
        (or handlers registered in djstripe plugins or contrib packages).
        
djstripe/models/core.py