Integrate Real Time XML Feed

I own an online retail site. All products are from 1 manufacturer/distributor. I need someone to integrate a real-time XML inventory feed to my OS Commerce website. The XML feed is password protected. It also depicts products that are sold in a set as having an inventory of -1. This does not mean that the set is out of stock...just that it is a set. Here is an example of part of the xml feed: - 2005-12-27T14:02:49.000 - - - - 1315 - - - 789 - - - -1 -