we have joomla 1.5.3 and Virtuemart 1.1.0. We have the site running on an ISP. The ISP controls the PHP, Apache, MySQL db runtime engine and configurations. We can however, install CGI scripts and interpreters.
We need the CyberSource payment module to be integrated with this environment. We the standard test card to work, as well as have a zero cost product process a real credit card.