Workflow Event - subscribers on integration event

Hi there,

I need to find Subscriber event (Customer Credit Limit is Exceeded). Does any one have a clue how to track subscriber events on one Integration (Business) event. I need to know this cause in Customer Credit Limit is Exceeded I need to add one more check - does customer has overdue balance.
If any one have experience, please let me know is this ok, or maybe it's better to have my WF Events Codeunit.

Best Regards