The basic idea is the only people who can add money to other peoples accounts are Admins+ But also the players can do /pay (Player name) (Amount) but No Shops or anything just so players have currency like the Gold money plugin but they cant take out the gold and they cant add any And the only way to get payed is by ranking up.... If you know a plugin already like this please tell me
Check the plugin Vault, inside it you will see a list of economy plugins. Check their features and you might find one that suits you.