Is this software actually usable now in real world commerce case?

I have internet cafe that I want to switch to run on crypto, all transactions done through crypto. People give me cash, I give them Ark card/chip that they use to login to my computer terminals or pay for goods. I want my own chain to track all transactions. Ark seems like good use case for this, many other coins have seemed like they can do this as well but after actually trying to implement do not provide this functionality. What language is this in (edit: found javascript on their github)? Whitepaper reads like written by novice without any technicals.