Refund of a Transaction

<?php
//-----------------------------------------------------------------------
// PapApi.class.php can be downloaded from the merchant panel at:
// Tools > Integration > API Integration > Download PAP API
require_once 'PapApi.class.php';

$pap_url = 'https://localhost/pap/'; // URL to PAP
$pap_user = 'merchant@example.com'; // Merchant username
$pap_password = 'demo'; // Merchant password
// log in as merchant
$session = new Pap_Api_Session($pap_url . "scripts/server.php");
if(@!$session->login($pap_user, $pap_password)) {
	die("Cannot login. Message: ".$session->getMessage());
}
//-----------------------------------------------------------------------
$transactionsGrid = new Pap_Api_TransactionsGrid($session);

$orderid = "ORD_123_AC"; //ID of order to be refunded.

// filter orders with the given order id -- so we filter also tier commissions, you can use here also another transactions filter
// Use filters very carefully, you can easily make refunds of all transactions!!!
//$transactionsGrid->addFilter("orderid", Gpf_Data_Filter::LIKE, '%'.$orderid.'%');
$transactionsGrid->addFilter("orderid", Gpf_Data_Filter::EQUALS, $orderid);

$response = $transactionsGrid->refund();
//$response = $transactionsGrid->refund('refund note', 0.5);
/* you can use parameters for affiliate note and fee.
* With defined fee the refunded commission value is calculated as (originalCommission * -1) - definedFee.
* For example refund of a $5 commission with fee set to 10 would produce a negative $15 commission for the affiliate.
*/

//for chargeback use: $response = $transactionsGrid->chargeback();
//or $response = $transactionsGrid->chargeback('chargeback note', 0.5);

if ($response->isError()) {
    echo 'Error: '.$response->toText();
} else {
    echo 'Success: '.$response->toText();
}

$transaction = new Pap_Api_Transaction($session);

$orderid = "ORD_123_AC"; //ID of order to be refunded, all transactions with this order id will be refunded
$transaction->setOrderId($orderid);

$result = $transaction->refundByOrderId();
//$result = $transaction->chargeBackByOrderId();
//$result = $transaction->refundByOrderId('affiliate note', '0.1');
//$result = $transaction->refundByOrderId('affiliate note', '0.1', 50);
/* you can use parameters for affiliate note, fee and refunded value.
* With defined fee the refunded commission value is calculated as (originalCommission * -1) - definedFee.
* For example refund of a $5 commission with fee set to 10 would produce a negative $15 commission for the affiliate.
* With defined refundValue only a partial refund for the defined value will be created.
*/
//$result = $transaction->chargeBackByOrderId('affiliate note', '0.1');
//$result = $transaction->chargeBackByOrderId('affiliate note', '0.1', 50);

if ($result->isError()) {
    echo 'Error: '.$result->getErrorMessage();
} else {
    echo 'Success: '.$result->getInfoMessage();
}