UserIDType ( string )
This is a string wrapper for the eBay ID that uniquely identifies a user. This is used by several other types to identify a specific eBay user, such as DisputeType.xsd, FeedbackInfoType.xsd, GetAllBidders, OrderType, and so on.
For GetAllBidders, some bidder information is anonymous, to protect bidders from fraud. If the seller makes this API call, the actual IDs of all bidders on the seller's item will be returned. If a bidder makes this API call, the bidder's actual ID will be returned, but information for all competing bidders or outside watchers will be returned as anonymized userIDs.
Type that uses UserIDType:
Call that uses UserIDType: