The unique identifier of an item listed on the eBay site.
Since a bidder's user information is anonymous, this tag will contain the real ID value only for that bidder, and the seller of an item that the user is
bidding on. For all other users, the real ID value will be replaced with the anonymous value, according to these rules:
When bidding on items listed on the US site: UserID is replaced with the value "a****b" where a and b are random characters from the UserID. For example, if the UserID = IBidALot, it might be displayed as, "I****A".
Note that in this format, the anonymous bidder ID stays the same for every auction.
(GetMyeBayBuying only) when bidding on items listed on the US site: UserID is replaced with the value "a****b" where a and b are random characters from the UserID.
When bidding on items listed on the UK and AU sites: UserID is replaced with the value "Bidder X" where X is a number indicating the order of that user's first bid. For example, if the user was the third bidder,
UserID = Bidder 3.
Note that in this format, the anonymous bidder ID stays the same for a given auction, but is different for different auctions. For example, a bidder who is the third and then the seventh bidder in an auction will be listed for both bids as "Bidder 3". However, if that same bidder is the first bidder on a different auction, the bidder will be listed for that auction as "Bidder 1",
not "Bidder 3".
(GetMyeBayBuying only) when bidding on items listed on the UK and AU sites: UserID is replaced with the string "High Bidder".
(GetBestOffers only) - all sites: The last part of the user ID is replaced with asterisks for users that submit best offers on an item. The seller of the item will be able to see the full User ID.
XML Representation Summary
XML Source (w/o annotations (1); see within schema source)