PHP Authorize.net Redirect Help

Hello,

I'm using the authorize.net AIM with PHP integration. What I have set up is a form on a site for shipping information, billing information, credit card number, etc. When the user hits submit, it transfers that information over to the authorize.net form through their HTTPS Post, then the user confirms everything on the form and processes credit card information.

What I was wondering was if there was a way to automatically redirect the user back to my website, and provide those same variables (used in the authorize.net form) through POST data so I can insert into the database the shipment information and other information on the payee so they can access this information on their administration panel in php.

If anyone can provide me with some step by step instructions that would be best because I have little experience with authorize.net and i'm trying to finish this project for work, i'm trying to find different ways of doing this but this is the best idea I have come up with. Otherwise I'd have to add the information to the database before the person pays and it may cause problems if they end up closing th ewindow or leaving without paying on authorize.net.

Thanks