$txnIdCs[0] = $response3['TransactionId'];
            $capDiffData = new CaptureDifferenceData();
            $capDiffData->TransactionId = $txnIdCs;
            if (Settings::IndustryType == 'Restaurant') {
                $capDiffData->TipAmount = '2.00';
                $capDiffData->Amount = $response->Amount + $capDiffData->TipAmount;
            }
            $capDiffData->Amount = '2.00';
            $capDiffXML = buildCaptureSelectiveXML($capDiffData);
            $txnIdsXML = buildTxnIdsXML($txnIdCs);
            $response2 = $client->captureSelective($txnIdsXML, $capDiffXML, null);
            printBatchResults($response4, $merchProfileId);
            // Note: You must provide an already captured Authorize TransactionId for ReturnById$returnDiffData = new ReturnByIdDifferenceData();
            $returnDiffData->TransactionId = $response3['TransactionId'];
            $returnDiffData->Amount = '2.00';
            $returnDiffXML = buildReturnByIdXML($returnDiffData);
            $response6 = $client->returnByID($returnDiffXML);
            printTransactionResults($response6, 'ReturnById After Capture', $merchProfileId);
        }
        /*
         *
         * Return funds to a specified acocunt
         * May also incluse , $amount) where $amount is what you want to return e.g. 10.00
         *
         */
        if ($_bcs['Operations']['ReturnUnlinked']) {
            $response7 = $client->returnUnlinked($bcpTxnXML);
            printTransactionResults($response7, 'ReturnUnlinked', $merchProfileId);
        }
    }
}
         * Authorize using credit card
         *
         */
        if ($_achs->Operations->Authorize) {
            $response2 = $client->authorize($eckTxn->TndrData, $eckTxn->TxnData);
            printTransactionResults($response2, 'Authorize', $merchProfileId);
        }
        /*
         *
         * Undo funds based on previous transactionId
         * May also include , $amount) where $amount is what you want to return e.g. 10.00
         *
         */
        if ($_achs->Operations->Undo) {
            // First send an Authorize to Void
            $response3 = $client->authorize($eckTxn->TndrData, $eckTxn->TxnData, $eckTxn->TxnData->Creds);
            // Now send the Void using TransactionId from above transaction response
            $response4 = $client->undo($response3->TransactionId, $eckTxn->TxnData->Creds);
            printTransactionResults($response4, 'Undo', $merchProfileId);
        }
        /*
         *
         * Capture an authorized transaction
         *
         */
        if ($_achs->Operations->CaptureAll) {
            $response5 = $client->captureAll(null, $eckTxn->TxnData->Creds);
            printACHBatchResults($response5, $merchProfileId);
        }
    }
}