Thank you every body! We finished osCommerce v2.3.0,v2.3.1,v2.3.2,v2.3.3 plugin development and upload to addon.
http://addons.oscommerce.com/info/8705
You can use it as an osCommerce API service also.
Any feedback or advice please feel free to let me know. Thank you!
We are testing for 2.1rc and 2.2rc also. Should release their support later.