Hi, First of all, I love this plugin.
I am running into this error now: When I try to relist ended items, changing them from auctions to fixed price (to take advantage of listing specials), I get this:
Error: Unsupported ListingType. (#21916286)
Valid Listing type for fixedprice apis are FixedPriceItem and StoresFixedPrice.
I searched & found this page, if it is any help for finding a solution.