private function cartTag($expedicion = '')
{
$requestParams = array('usuario' => 'takezo_p', 'clave' => 'hBXlqzCvV8', 'origen' => '008', 'expedicion' => $expedicion, 'bulto' => '', 'formato' => 'PDF');
$client = new SoapClient('https://wscli.zeleris.com/EXPDatos.asmx?wsdl', array('cache_wsdl' => 0, 'soap_version' => SOAP_1_1, 'trace' => 1));
$response = $client->EtiquetaEXP($requestParams);
$xml = simplexml_load_string($response->EtiquetaEXPResult);
file_put_contents(FCPATH . "pdf/{$this->Cart->id}.pdf", base64_decode($xml->expedicion->datos_etiqueta->label_data));
}