Agreed that it is possible, but it's not only install. You need to maintain it.
Their page mentions only VPS for $10+, do you have tips for $2-$5 VPS? Might be useful for other projects. What Lightning node do you use in this low-cost setup?
Anyway - the point of CashuPay is that it can run on what you already have (PHP hosting for your e-shop). You don't need anything extra, not even $2 VPS. Just unzip and go.
P.S.: I am fan of BTCPay, if it's not a problem for you, run it, I also run one. This project is for people for whom the more complicated setup is a barrier to accepting Lightning.
