Drupal T3 Blank Demo

I'm currently working with HeyWatch, a web service that encodes videos. Ideally, this would become a module (HeyWatch CCK has stalled for a long time).

After I submit a video to HeyWatch via POST, and the video is successfully encoded, I will be redirected to a certain page, let's say

http://www.mysite.com/success.php?argument=xxx

Once I get redirected to success.php, I would like to create a new node with certain terms depending on the argument xxx I get.

Could anybody please give me some pointers how to do so?

Thanks.