Ok so I connect it and it beeps but when I connect the multimeter most of the non power related wires are showing .01 volts i believe. The yellow wire shows 5 volts.
Your documentation says this (edited down):
White line—(N.C. signal)
Green line—(N.O. signal)
Black Line—Ground (GND)
So if you power this device and put the multimeter probes on black and white and then black and green neither one registers a voltage difference? That doesn't make sense to me, they way I read that data, there should be a voltage there. I guess try both and have it accept a coin while you have the multimeter connected and see if it produces a pulse, though a multimeter is not the best tool for this because that pulse is going to be short.
I mentioned an optoisolator because it isolates as well as converting levels. Any level converter will do, you can use a cheap transistor, but you don't get the isolation.