Gateway generated transaction identifier returned in the response of the original transaction. This indicates the Alt Payment transaction to be voided.
<xs:complexTypename="PosAltPayVoidReqType"xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:all><xs:elementname="TransactionType"type="AltPaymentTxnType"><xs:annotation><xs:documentation><pxmlns="http://Hps.Exchange.PosGateway">Alternate Payment Transaction Type</p></xs:documentation></xs:annotation></xs:element><xs:elementname="GatewayTxnId"type="txnIdType"><xs:annotation><xs:documentation><pxmlns="http://Hps.Exchange.PosGateway">Gateway generated transaction identifier returned in the response of the original transaction. This indicates the Alt Payment transaction to be voided.</p></xs:documentation></xs:annotation></xs:element></xs:all></xs:complexType>