In either spicecfg, or in the game you can press F4 to get to the menu, you need to map a button for test, service, and swipe card. I use T and S on my keyboard since they aren't mapped to anything else on my set up and easy to remember, and space bar to swipe my card, but you can make them whatever you want.
For test and service, one inserts coins, the other brings up the operator menu. In the operator menu you can set free play if you want then you don't need coins. On my set up we have paseli turned on, and the Asphyxia plugin is set up so you have unlimited paseli so every time you swipe your eamusement card you can "pay" that way.