Quoted from ForceFlow:
I've see a number of pins on location without a nearby change machine or a dollar bill acceptor. So, I ended up passing on them. I imagine the general public doesn't bother to go too far to hunt down some change.
I was thinking about putting an older Gottlieb machine on location, but that game has one of those weird narrow coin doors, so a dollar bill acceptor is impossible to install, and I probably won't be able to get my hands on a cheap change machine. So, mobile payments might be the only way to go.
The only question next is how it can be integrated into a vintage machine since they don't have that 6-pin molex cable for power & data.
The device powers a relay/transistor "x"amount of times and that relay/transistor drives a contact you parrallel with the coin mech switch, most likely. And if not its an easy way todo it id say.