I want players to be able to purchase ranks in-game using their in-game money. I do have CustomGUI, which lets me charge players for pressing a button in a GUI which can then trigger a command such as one that promotes them to a higher rank, but that’s not quite enough. I need players to be required to purchase lower ranks before they can purchase higher ones. For instance, if a player wants to purchase Rank 2, they have to purchase Rank 1 first. If they want Rank 3, they need Rank 2, for which they need Rank 1. Also, it shouldn’t be possible to purchase the same rank more than once. My server is running PaperMC #57 for Minecraft 1.15.1, and I’m using LuckPerms. Does anyone know if there’s a plugin that can do this? Any suggestions are appreciated!