Receiving API POST

I'm having trouble receiving data via POST from Cielo API. I've already talked to King Host and everything is okay with certificates and so on.

I've been browsing GitHub and found a similar topic: link

I followed the recommendations but without success, the Database does not do the Update.

I'm using the CodeIgniter 3 framework, and put the notification and status pages in the Public folder

Follow the page code

$order_number = $_POST['order_number'];
if(isset($order_number)){
//as variaveis de conexão eu escondi
$pdo = new PDO("mysql:host=$host; dbname=$dbname", $userdb, $userpass);
$pdo->exec("SET CHARACTER SET utf8");      // Sets encoding UTF-8
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$sql = 'UPDATE 'tb_store_orders' SET 'details_ship' = :details_ship, 'order_shipping' = :price_ship, 'order_status' = :order_status, 'order_tid' = :order_tid WHERE 'order_number' = :order_number';

        $mod_ship = $_POST['shipping_type'];
        $name_ship = $_POST['shipping_name'];
        $price_ship = $_POST['shipping_price'];
        $cep_ship = $_POST['shipping_adress_zipcode'];
        $dist_ship = $_POST['shipping_adress_district'];
        $city_ship = $_POST['shipping_adress_city'];
        $state_ship = $_POST['shipping_state'];
        $adre_ship1 = $_POST['shipping_adress_line1'];
        $adre_ship2 = $_POST['shipping_adress_line2'];
        $number_ship = $_POST['shipping_adress_number'];
        $details_ship = $mod_ship.'<br>'.
                        $name_ship.'<br>'.
                        $price_ship.'<br>'.
                        $cep_ship.'<br>'.
                        $state_ship.'<br>'.
                        $city_ship.'<br>'.
                        $adre_ship1.', '.$number_ship.', '.$adre_ship2.', '.$dist_ship;
        $order_status = $_POST['payment_status'];
        $order_tid = $_POST['tid'];

 $statement = $pdo->prepare($sql);
 $statement->bindValue(":details_ship", $details_ship);
 $statement->bindValue(":price_ship", $price_ship);
 $statement->bindValue(":order_status", $order_status);
 $statement->bindValue(":order_tid", $order_tid);
 $statement->bindValue(":order_number", $order_number);

$count = $statement->execute();
  $pdo = null; 
        echo '<status>OK</status>';
        }
        echo 'Nenhum';
?>

Does anyone have any suggestions?