Creating a custom UiPath connector for an API

I am not entirely sure how it works. From what I understand, UiPath provides the URL so that Evolution can notify on that URL when an event occurs.

So, after generating the URL in UiPath Studio, I pasted it into Evolution.
I set a breakpoint to see what the activity was bringing, but it returns everything as null. I am not sure if it is working correctly.

How do I set up the events? That is what I do not know.
Is there any configuration to be done in Orchestrator? I found the option to create webhooks in Integration Services, but I believe that is for the reverse path. That is, for another application to capture the events created by UiPath. Am I correct?

Thank you for your responses.