Testing Webhooks With Postman?

So I want to see if this is possible. Right now to test webhooks we have an application where we enter a requestbin url for instance. Once the webhook event triggers it sends the request to that particular URL.

Normally this is a manual process to verify on the requestbin end. I know there are some services like Beeceptor and Webhook.site that also contain API’s to retrieve the request data that was sent.

Someone suggested this might be possible with Postman. I essentially need an automated way to retrieve “requests” that are sending to a specific URL/request “listener”. I can trigger the events via Automated testing and can hopefully assert against the API that the webhook trigger happened.

Can I use something like Postman mock servers to capture events and then call against that to confirm they were captured? Maybe using Newman? And is it something we can self host if thats the case?