Página de Respuesta

<?php
$ApiKey = "4Vj8eK4rloUd272L48hsrarnUA";
$merchant_id = $_REQUEST['merchantId'];
$referenceCode = $_REQUEST['referenceCode'];
$TX_VALUE = $_REQUEST['TX_VALUE'];
$New_value = number_format($TX_VALUE, 1, '.', '');
$currency = $_REQUEST['currency'];
$transactionState = $_REQUEST['transactionState'];
$firma_cadena = "$ApiKey~$merchant_id~$referenceCode~$New_value~$currency~$transactionState";
$firmacreada = md5($firma_cadena);
$firma = $_REQUEST['signature'];
$reference_pol = $_REQUEST['reference_pol'];
$cus = $_REQUEST['cus'];
$extra1 = $_REQUEST['description'];
$pseBank = $_REQUEST['pseBank'];
$lapPaymentMethod = $_REQUEST['lapPaymentMethod'];
$transactionId = $_REQUEST['transactionId'];

if ($_REQUEST['transactionState'] == 4 ) {
	$estadoTx = "Transacción aprobada";
}

else if ($_REQUEST['transactionState'] == 6 ) {
	$estadoTx = "Transacción rechazada";
}

else if ($_REQUEST['transactionState'] == 104 ) {
	$estadoTx = "Error";
}

else if ($_REQUEST['transactionState'] == 7 ) {
	$estadoTx = "Pago pendiente";
}

else {
	$estadoTx=$_REQUEST['mensaje'];
}


if (strtoupper($firma) == strtoupper($firmacreada)) {
?>
	<h2>Resumen de la transacción</h2>
	<table>
	<tr>
	<td>Estado de la transacción</td>
	<td><?php echo $estadoTx; ?></td>
	</tr>
	<tr>
	<tr>
	<td>ID de la transacción</td>
	<td><?php echo $transactionId; ?></td>
	</tr>
	<tr>
	<td>Referencia de venta</td>
	<td><?php echo $reference_pol; ?></td>
	</tr>
	<tr>
	<td>Referencia de la transacción</td>
	<td><?php echo $referenceCode; ?></td>
	</tr>
	<tr>
	<?php
	if($pseBank != null) {
	?>
		<tr>
		<td>cus </td>
		<td><?php echo $cus; ?> </td>
		</tr>
		<tr>
		<td>Banco </td>
		<td><?php echo $pseBank; ?> </td>
		</tr>
	<?php
	}
	?>
	<tr>
	<td>Valor total</td>
	<td>$<?php echo number_format($TX_VALUE); ?></td>
	</tr>
	<tr>
	<td>Moneda</td>
	<td><?php echo $currency; ?></td>
	</tr>
	<tr>
	<td>Descripción</td>
	<td><?php echo ($extra1); ?></td>
	</tr>
	<tr>
	<td>Entidad:</td>
	<td><?php echo ($lapPaymentMethod); ?></td>
	</tr>
	</table>
<?php
}
else
{
?>
	<h1>Error validando la firma digital.</h1>
<?php
}
?>

http://mypaginadeprueba.com/response.php?&merchantId=508029&merchant_name=Test+PayU+Test&merchant_address=Av+123+Calle+12&telephone=7512354&merchant_url=http%3A%2F%2Fpruebaslapv.xtrweb.com&transactionState=6&lapTransactionState=DECLINED&message=Declinada&referenceCode=2015-05-27+13%3A04%3A37&reference_pol=7069375&transactionId=f5e668f1-7ecc-4b83-a4d1-0aaa68260862&description=test_payu_01&trazabilityCode=&cus=&orderLanguage=es&extra1=&extra2=&extra3=&polTransactionState=6&signature=e1b0939bbdc99ea84387bee9b90e4f5c&polResponseCode=5&lapResponseCode=ENTITY_DECLINED&risk=1.00&polPaymentMethod=10&lapPaymentMethod=VISA&polPaymentMethodType=2&lapPaymentMethodType=CREDIT_CARD&installmentsNumber=1&TX_VALUE=100.00&TX_TAX=.00&currency=USD&lng=es&pseCycle=&buyerEmail=test%40payulatam.com&pseBank=&pseReference1=&pseReference2=&pseReference3=&authorizationCode=&TX_ADMINISTRATIVE_FEE=.00&TX_TAX_ADMINISTRATIVE_FEE=.00&TX_TAX_ADMINISTRATIVE_FEE_RETURN_BASE=.00