Omnipay refund

// Do a refund transaction on the gateway
$transaction = $gateway->refund(array(
    'amount'                   => '10.00',
    'transactionReference'     => $sale_id,
));
$response = $transaction->send();
if ($response->isSuccessful()) {
    echo "Refund transaction was successful!\n";
    $refund_id = $response->getTransactionReference();
    echo "Transaction reference = " . $refund_id . "\n";
}

Source: apigen.juzna.cz

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