protected function enviaRequisicao(Requisicao $requisicao)
{
$request = $this->httpClient->post($this->getEndpoint())->addPostFields(array('mensagem' => $requisicao->getEnvio()->asXML()));
foreach ($this->curlOpcoes as $opcao) {
$request->getCurlOptions()->set($opcao['nome'], $opcao['valor']);
}
$requisicao->setResposta($request->send()->xml());
return $requisicao;
}