The client will configure some listening ports to receive the requests in its webhooks, but they need to know which are the sources that are going to send said requests from DX OI.
Release : 21.3
Webhook notifications are handled by the DX-OI Service named dxi-notify in the container named also dxi-notify, using the same URL as the dx platform (there is no specific route for this service).
This information is for onPrem. For SaaS, check KB188477