Client-generated transaction identifier.
<xs:element name="ClientTxnId" type="clientIdType" minOccurs="0" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:annotation> <xs:documentation> <p xmlns="http://Hps.Exchange.PosGateway">Client-generated transaction identifier.</p> </xs:documentation> </xs:annotation> </xs:element>