As a side not I'm in the process of making a proof of concept payment device for arcade machines, in particular for pinball machines.
I've already proven the core code and just received the display I need today to progress it to the next stage.
I'm currently developing it for Feathercoin using the API on their website.
If a cashcode API is also made it could be easily adapted to work for Cash and all the code will be available on Github.
It written in python and I'm still very much learning python, so I'm sure it can be improved upon.