PDO bindParam не работает «bindParam () для необъекта»

Я пытаюсь обработать платежный процессор Mollie для создаваемой CMS, но столкнулся с проблемой. Когда я пытаюсь ввести данные в базу данных MySQL, он этого не делает. Я получаю эту ошибку:

Неустранимая ошибка: вызов функции-члена bindParam () для необъекта в /home/ubuntu/workspace/examples/01-new-payment.php в строке 83

Это полный код:

<?php
/*
* Example 1 - How to prepare a new payment with the Mollie API.
*/

$amount      = 100.50;
$description = "Booking for Villa Hijau";
$days        = 10;
$name        = "####";
$email       = "####";

try {
/*
* Initialize the Mollie API library with your API key.
*
* See: https://www.mollie.com/beheer/account/profielen/
*/
include "initialize.php";

/*
* Generate a unique order id for this example. It is important to include this unique attribute
* in the redirectUrl (below) so a proper return page can be shown to the customer.
*/
$order_id = time();

/*
* Determine the url parts to these example files.
*/
$protocol = isset($_SERVER['HTTPS']) && strcasecmp('off', $_SERVER['HTTPS']) !== 0 ? "https" : "http";
$hostname = $_SERVER['HTTP_HOST'];
$path     = dirname(isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : $_SERVER['PHP_SELF']);

/*
* Payment parameters:
*   amount        Amount in EUROs. This example creates a € 10,- payment.
*   description   Description of the payment.
*   redirectUrl   Redirect location. The customer will be redirected there after the payment.
*   webhookUrl    Webhook location, used to report when the payment changes state.
*   metadata      Custom metadata that is stored with the payment.
*/
$payment = $mollie->payments->create(array(
"amount" => $amount,
"description" => $description,
"redirectUrl" => "{$protocol}://{$hostname}{$path}/03-return-page.php?order_id={$order_id}",
"webhookUrl" => "{$protocol}://{$hostname}{$path}/02-webhook-verification.php",
"metadata" => array(
"order_id" => $order_id
)
));

/*
* In this example we store the order with its payment status in a database.
*/
database_write($order_id, $payment->status, $amount, $description, $days, $name, $email);

/*
* Send the customer off to complete the payment.
*/
header("Location: " . $payment->getPaymentUrl());
}
catch (Mollie_API_Exception $e) {
echo "API call failed: " . htmlspecialchars($e->getMessage());
}/*
* NOTE: This example uses a text file as a database. Please use a real database like MySQL in production code.
*/
function database_write($order_id, $status, $amount, $description, $days, $name, $email)
{
$db_user  = 'mollie';
$db_pass  = '####';
$order_id = intval($order_id);
// Use $status to get the order status
$dbh      = new PDO('mysql:host=localhost;dbname=orders', $db_user, $db_pass);
$stmt     = "INSERT INTO order (id, order_name, order_description, order_amount, order_customer, order_customer_email, order_status) VALUES (?,?,?,?,?,?,?)";
if($stmt){
$stmt->bindParam($order_id,$name,$description,$amount,$name,$email,$status);
$stmt->execute();
}
}

Заранее спасибо!
Рик