I dont know if this is made or not but here we go. This plugin should be able when you do /shop it opens a GUI menu and you can buy PERMISSIONS like a trail permission or something like that for essentials eco money.
@nverdier i tried this its very complicated for me to go to different plugins and configure it and when i try CommandsForSale it says i have all perms so it won't work. Chest Commands is pretty good so i guess maybe something that can work with Chestcommands or just an actual plugin.