MyMessagesExternalMessageIDType ( string )
Type defining the ExternalMessageID field used in GetMyMessages to identify a specific eBay message to retrieve. Up to 10 ExternalMessageID values can be specified in one API call. The ExternalMessageIDs container is only available for use on the eBay US site (SiteID 0).
Type that uses MyMessagesExternalMessageIDType:
Call that uses MyMessagesExternalMessageIDType: