PHP SDK- Litle Credit Transaction

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<?php
require_once realpath(dirname(__FILE__)) . '/../lib/LitleOnline.php';

#Credit
#litleTxnId contains the Litle Transaction Id returned on 
#the capture or sale transaction being credited
#the amount is optional, if it isn't submitted the full amount will be credited

$credit_info = array(
		'litleTxnId'=>'100000000000000002',
                 'id'=> '456',
       		'amount'=>'1010'
		);
$initilaize = new LitleOnlineRequest(); 
$creditResponse = $initilaize->creditRequest($credit_info);

#display results
echo ("Response: " . (XmlParser::getNode($creditResponse,'response')) . "<br>");
echo ("Message: " . XmlParser::getNode($creditResponse,'message') . "<br>");
echo ("Litle Transaction ID: " . XmlParser::getNode($creditResponse,'litleTxnId'));

Please make sure to adjust the pathname, before running any tests