Can confirm, been working with many eBay APIs for a while now and it's completely and totally a massive dumpster fire. Most API versions are in the thousands, and there's so many random gotchas and contradicting docs and daily bugs and breakages you don't want to go anywhere near it. Not to mention their only recourse for contacting them about bugs or developer issues is via prepaid premium support, paid only via paypal, in which the link for it frequently goes down too. If you check their dev forums it's filled with nothing but people complaining about all sorts of random issues and never getting real responses.