Buy Premium Service in NPC

[Corazon]

I wanna make one NPC can buy premium service and Cash Coint but i don't know how to setting it...

anyone can help me to setting it?

sorry for my bad english

 

[likertuban]

Create your own module, dont start asking question "it's module? Not setting? Not database?" The answer is no, most of private server sell cash point and premium potion, and it use module