This plugin adds a permission shop to the server the plugin is installed on. In this shop players can buy permissions with their money which then allows the player to do anything the permission allows him/her to do. The plugin has native support for some populair permission managers such as: GroupManager, PermissionsEx and LuckPerms, it also allows users to add custom support for any command based permission manager of their choosing.
I have posted some screenshots of the plugin on the SpigotMC resource page.
The source code of this plugin is publicly avalible on my GitHub page.