How to connect Callback IPA from VKontakte groups to the server?

Question

In contact with

Perhaps the problem is not so big, but, unfortunately, it is not clear what should be the server for receiving notifications from VKontakte groups via Callback IPA. ( https://new.vk.com/dev/callback_api)
Support responded with the following:

This is just the address where the notification handler is available - the script that will respond to event notifications. What it will be - it's up to you, you can place the script anywhere, including on an existing server.

How to connect this "destination server address" and is it possible to connect it to any server that offers this feature?