Hi,
I too have run into this little road block. I wish Scott Trimble would specifically created a video that specifically addresses the eBay plugin issue as it is obvious that of all the plugins this one is the trickiest to setup.
With that said, once you are accepted in the eBay Partner Network I found the following set of videos very helpful. In particular it actually talks about to some degree the Custom ID and Campaign IDs a bit.
http://eyeview.vo.llnwd.net/o23/eBay/FullMode/Player/Player.html?Video=2&Lang=ENThat 's the link. You may have to be logged into their Network before you can view this info - not sure.
Hope this helps folks out....
Christopher
