Paypal Flow query

Paypal Flow query

Hello

I'm struggling to solve a paypal-> flow related problem. I have the hook in place and am receiving data from the payment complete trigger, for new and reccuring payment... after some decision filtering a new 'Subscription' module entry is created.

What I'm struggling to work out, is a successful way to measure churn. When a payment fails, so as to fetch and Delete module entry.

The debug action in the flow builder gets stuck on 'waiting for hook', so I'm pretty limited in ways to trial and error this flow.

Any help would be great!!