osCommerce Authorize.net CIM
We have a pre-built CIM for osCommerce. Been tested with the latest osCommerce version 2.3.3.4, plus 2.3.0, 2.3.1, and 2.3.2 on servers running PHP 5.2.17 and 5.3.28. Contact us for pricing.
Current version is 1.0.2. PHP cURL recommended, but not required.