I am building the system to listen to the Payment changes in PayPal for that I research and recommended using Webhooks over the IPN.
As of now, I can able to create an app and add webhooks with event subscribers. Also, with the webhook simulator I am getting notified correctly but with the actual Payment made in the sandbox does not trigger anything to the listener.
I have verified the correct business account linked with credentials as well.
Everything is working perfectly except the Webhooks triggering from PayPal.
Also, as noting is triggering I do not have debug id as well.
If you have not registered any webhook listeners for any of your REST Apps (either sandbox or live), PayPal will not send any webhooks because it does not know which ones to send events for, or where to send them.
To register webhooks for an app, either:
Until you register a listener URL for event(s), no webhooks will be sent.