It does not need hex, check my post. Unless if he wants to change the 'P' to 'R' then it'll need a hex.
that image is from pRO and already hex to RoK and cashpoints to P. by default our client doesnt show RoK.
You just need this to setup your own cash/rok points npc
http://svn.code.sf.net/p/rathena/svn/trunk/npc/merchants/cash_trader.txt