Oscommerce with dynamo one page checkout - need google analytics ecommerce tracking setup

We have a modified oscommerce setup with a modified dynamo effects one page checkout. We need to add google analytics ecommerce tracking. The challenge is that the order data existing in a process but is no longer available when we get to checkout_success.php. I am looking for someone who is familiar with eCommerce tracking and modified checkouts in Oscommerce to fix.