public function getTransactionReference()
    {
        $reference = [];

        foreach (['TxAuthNo', 'VPSTxId'] as $key) {
            $value = $this->getDataItem($key);

            if ($value !== null) {
                $reference[$key] = $value;
            }
        }

        // If there is no auth number or VPS transaction ID, then
        // there is no reference to speak of; return null.

        if (empty($reference)) {
            return;
        }

        // The security key is passed in as a parameter by the application,
        // and not POSTed from the gateway.

        $reference['SecurityKey'] = $this->getSecurityKey();

        $reference['VendorTxCode'] = $this->getTransactionId();

        ksort($reference);

        return json_encode($reference);
    }
public function getTransactionReference()
    {
        $reference = [];

        foreach (['TxAuthNo', 'VPSTxId'] as $key) {
            $value = $this->getDataItem($key);

            if ($value !== null) {
                $reference[$key] = $value;
            }
        }

        // If there is no auth number or VPS transaction ID, then
        // there is no reference to speak of; return null.

        if (empty($reference)) {
            return;
        }

        // The security key is passed in as a parameter by the application,
        // and not POSTed from the gateway.

        $reference['SecurityKey'] = $this->getSecurityKey();

        $reference['VendorTxCode'] = $this->getTransactionId();

        ksort($reference);

        return json_encode($reference);
    }
public function getTransactionReference ( ) { $ reference = [ ] ; foreach ( [ 'TxAuthNo' , 'VPSTxId' ] as $ key ) { $ value = $ this -> getDataItem ( $ key ) ; if ( $ value !== null ) { $ reference [ $ key ] = $ value ; } } // If there is no auth number or VPS transaction ID, then // there is no reference to speak of; return null. if ( empty ( $ reference ) ) { return ; } // The security key is passed in as a parameter by the application, // and not POSTed from the gateway. $ reference [ 'SecurityKey' ] = $ this -> getSecurityKey ( ) ; $ reference [ 'VendorTxCode' ] = $ this -> getTransactionId ( ) ; ksort ( $ reference ) ; return json_encode ( $ reference ) ; }
Gateway Reference.

@return string|null A reference provided by the gateway to represent this transaction
Gateway Reference .