I don't think there's a coil slot. I believe it has a bill slot, like on Coke vending machines. But this one probably doesn't accept anything with single or double digits.
I wonder how they find their beta testers. I'd LOVE to sign up!!
I once went to visit an undisclosed facility for which I needed security clearance. (hence undisclosed)
I learned that they had a full-mo sim for some fighter jets. (again, undisclosed)
It should suffice to say that I brought several hundred dollars in cash for an obvious attempt at bribery. But never got any close to the sims.