Getting info off an HTTPS page

Hi, I am working on setting up a VPOS system, and I need to read the results of sending the CC information to the bank. When sending the form I am doing it with HTTPS port 443 with POST method in my form and application/www-form-urlencoded When I get the results of my submission I get another https URL . Since I send the form using POST, I get no params in the URL. BTW, GET is not supported. What I need to do is be able to read the results of that page so I can parse them and have the machine understand what was the result of the credit card charge. Any idea of how I can get to save the results of that page into a variable? Thanks! Carlos.