PAC saves player data once the player rejoins after registering.
So if I create a new acc called 'authority_problems', /register it without leaving and transfer 300 k using !givecash authority_problems 100000 3 times and rejoin the game, the money will be gone. If I /register, rejoin, and then !givecash it will be saved.
On the other hand, if I register 'authority_problems', leave the game, go to PAC and transfer my account to authority_problems the transfer won't work. Both accounts will be gone because you can't transfer to an already-existing account.