private function provideXML($amount = null)
{
$xml = '<?xml version="1.0"?>
<ncresponse
ORDERID="123"
PAYID="0"
NCSTATUS="5"
NCERROR=""
ACCEPTANCE=""
STATUS="5"
AMOUNT="' . ($amount ? $amount : '1') . '"
CURRENCY="EUR"
PM=""
BRAND=""
NCERRORPLUS="">
</ncresponse>';
return $xml;
}