Plugin Request

Hey guys I am looking for a GUI Shop plugin but the catch is, it is for sponge. Either just port the one I have below over to sponge or make one from scratch, thanks guys.

Why even use sponge? Why not use something that does the exact same job and has more support and plugins? Why not use spigot. If you use spigot, you get exactly what you need, which can a publicly available and updated

What version ?
These type of plugin doesn't exist for 1.8.X and 1.9.X because it's not possible to do it...