I added new categories to my eBay store but they don’t show up in WP-Lister.

Unfortunately, WP-Lister doesn’t get notified automatically by eBay when you create new store categories on your eBay account. 

To refresh your store categories you need to visit WP-Lister -> Settings -> Accounts and click on “Refresh details”. This will will update all site specific details like categories, payment methods and shipping services for the eBay site selected.