I would this plugin add please

I would like this plugin added please it would like to use it in my Minecraft pixelmon server so player can sell there thing like coal,iron.pokemons,ect. here the like to take a look

GTS-Sponge-Reforged-7.2.1-5.2.3.jar

this will help my pixelmon server a lot and it would save me hours of coding. Also it would help the player in my server sell there thing and trade in game currency to buy other peoples things like pokemon thanks.