Hi,
I’ve tried to use this plug-in, but I know I must be missing some important information.
First of all, when you say “feed”, do you mean the rover address that ebay gives you or RSS?
Secondly, saying put the shortcode [ebayaffiliate] needs more explanation. If “[ebayaffiliate]” is all you put in the page or post, it doesn’t not work.

It gives me this: array_slice() expects parameter 1 to be array, null given in /home1/username/mywebsite/wp-content/plugins/linekal-ebay-affiliate-system/ebay-affiliate-system.php on line 77
(I replaced my username and web address for privacy purposes).

I think there would be great response to this plugin for people who are interested in working with ebay, but the instructions are not written for affiliate marketers, who don’t understand programming. They are written for people, who write and understand code.
I will be happy to give your plug-in a review once I get it working.
Thank you so much, Linda