This is a plugin that will allow players to use in-game currency with the help of Essentials and Vault (two other plugins) to purchase XP levels.
Permissions:
wonemy.create // To Create sign
wonemy.buylvl // To Buy Levels
wonemy.breaksign // To Remove sign
How to Make the Sign:
Line 1 "[LevelUp]
Line 2 "Levels"
Line 3 "Price"