Desktop Recharge Software for Siemens TC35i Modem (Lapu/demo Sim) - open to bidding

I want a software for PC that will recharge automatically when request through website comes on siemens modem. There are 8,16,24,32,64 etc port modem available in which we can insert sim cards. These sim cards are know as LAPU sim cards which are used to recharge prepaid mobiles. As far i know sim cards works on AT commands to communicate with operator network. I have modem but i need a software which will work with this modem to recharge automatically when request comes via website or api.