This item should not be seen as closed, I tried to work with the usps.php file to change from the production server to the secure server, but as Adam says here, it is kind of dependant on the http_client.php file. We really need a solution to this problem and are willing to pay for a solution, since neither oscommerce or CREloaded has addressed this issue, and support for the old URLs for USPS do not work.
Is there a way to prove that the code is not affected by this change in usps?