Set user status to active / non-active ?

Hello freeradius-users, how to set user status to active / non-active? I use PPPoE (MikroTik PC RouterOS) already connect with FreeRadius + MySQL, i want to manage user's that haven't pay the bill.. so i will need to set it to non-active, then if the users already pay the bill, i will set it back to active. i mean.. i need to know what i need to set in freeradius database or conf? -- Best regards, Yudi mailto:yudiw@centrin.net.id