public function retorno_pagamento(){

        $raw_post_data = file_get_contents('php://input');

        //file_put_contents(FCPATH . 'pagamento.txt', $raw_post_data, FILE_APPEND);

        $raw_post_response = 'cmd=_notify-validate&' . $raw_post_data;

        if(!empty($raw_post_data)) {
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, 'https://www.paypal.com/cgi-bin/webscr');
            curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $raw_post_response);
            curl_setopt($ch, CURLOPT_SSLVERSION, 6);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
            $response = curl_exec($ch);
            curl_close($ch);
        }

        //file_put_contents(FCPATH . 'pagamento.txt', $response, FILE_APPEND);

	if ($response == "VERIFIED" && $_POST['receiver_email'] == "XXXX") {

		if ($_POST['payment_status'] == "Completed") {

                    $code           = $_POST['txn_id'];
                    $status         = '3';
                    $valor          = $_POST['mc_gross'];
                    $clienteNome    = $_POST['first_name'] . " " . $_POST['last_name'];
                    $clienteEmail   = $_POST['payer_email'];
                    $clientePhone   = '';
                    $pagamentoTipo  = '1';
                    $itemID         = $_POST['item_number'];

                    $pedidos = $this->vendas->getAll(array(
                        'vendaTransacaoID' => $code
                    ));

                    if ($pedidos->num_rows() == 0) {
                        $id = self::_gravaRetorno($code, $itemID, $clienteNome, $clienteEmail, $clientePhone, $pagamentoTipo);
                        self::_atualizaStatus($id, $status);
                    }
                }

                if($_POST['payment_status'] == "Denied") {

                    $code           = $_POST['txn_id'];
                    $status         = '7';
                    $valor          = $_POST['mc_gross'];
                    $clienteNome    = $_POST['first_name'] . " " . $_POST['last_name'];
                    $clienteEmail   = $_POST['payer_email'];
                    $clientePhone   = '';
                    $pagamentoTipo  = '1';
                    $itemID         = $_POST['item_number'];

                    $pedidos = $this->vendas->getAll(array(
                        'vendaTransacaoID' => $code
                    ));

                    $id = self::_gravaRetorno($code, $itemID, $clienteNome, $clienteEmail, $clientePhone, $pagamentoTipo);
                    self::_atualizaStatus($id, $status);
                }


	} else {
            redirect();
        }
    }