I'm requesting a plugin that will make me able to put a user in a group, and then make it automatically leave it. For example: Player1 donates money by PayPal/Google Checkout or similar. Player1 sends order ID to Admin by MCF. Admin promotes player1 to Donator. After 30 days he get's back to his previous group. Optional: After 30 days he goes back to the Was a Donator group. I don't know if it's possible, but if you by Permissions(Bukkit) can be in two groups at the same time? This would'nt be important.
