Well, it's not really a coin door, it's a plate assembly that would fit into certain model doors. If you just want the feeling of putting in coins, without actually having an openable door, you could still use that, but it's not really meant to be a stand alone device.
To answer your question, it comes with a $.25 mech, which is the thing that actually accepts your quarters and rejects everything else, and the exploded view shows that the assembly has the microswitch on it, so it should come ready to be hooked up, but like I said it's not really a door it's a part of one.