You're in for a somewhat large project there. The connector is for an electronic coin mechanism.
Odds are, if the electronic mechanism was fitted, there may be mounting hardware for the mechanical mechs missing.
The wires from that harness may need to be moved to the coin switches below. I also notice a lamp socket is missing in your coin door.
The easiest solution would be, IMO, to find an identical door wired for mechanical switches, set the two side by side, and remove the extra wiring, and reterminate the wires that are needed for the coin switches.
I like a challenge, so I'd rewire it properly.. but most would just replace it.
