Custom Post Type Permalinks

Hey guys!
Some time ago I spent hours and hours for days with trying to get a very unique permalink structure working… and I gave up. Now, a few months later, I’m picking up the project again and I don’t wan’t
to read half the internet again. I only need a really simple permalink structure like domain.com?v=%post_id% just like the normal ?p=%post_id% (I don’t need regular posts though, that one can be changed).