In this tutorial we will create a new interface and use it to interact with something, in this case it will be a vehicle.
Any actor that uses the interface can do something with it when interacted with, it comes with a light switch example, but in this tutorial let’s make a vehicle.
But basically just add the Interact MP Server interface to the actor you wish to interact with:
For demo purposes, you can duplicate one of the vehicles, add the interface to it, delete most of it’s existing logic (leave WASD and health logic), but recreate the enter/exit vehicle logic to use that new interface and replicated player controller
FPS Game Starter Kit 