CC Bill Postback

I have a Escort site with ccbill as my payment gateway. I'm using my own user manager. The user can log in select a payment type purchase credits with there credit card that all works fine. What I need: ccbill will background post certain fields (I have the names of the fields) I want to to get the user info (user name, password, etc.) and add them as a new member in a mysql database. I need a postback script to write the information from CC Bill to my batabase Thank you Kwesi T. Bovell