Adding currency into an RP gamemode

well i have a problem my gamemode does not use your run of the mill class system, you create a character at the start. the problem with this is that i cannot implement a currency system. it is essential for my zombie RP gamemode to prchase new weapons and pay for services. if anyone could give me any help or feedback to my situation it would be much appreciated

http://www.facepunch.com/showthread.php?p=17791957#post17791957