Basic Micro Payment System for SMS Studio

I have an SMS Studio - SMS Gateway and i would like to have a program to do the following -Users will send and SMS to certain shortcode and once the sms is received by SMS Studio it will interface with yor program to generate a random code which will be send to the user -At the same time such code should be sent to certain website (via XML) in order to let the transaction in the website proceed. -the software needs only to generate the code and send it to 2 places, the handset user and this website budget is US$120