PHP Stripe получает идентификатор транзакции после успешной покупки

Я пытаюсь получить идентификатор транзакции после покупки, но он возвращает пустое на странице благодарности

order.php

<?php \Stripe\Stripe::setApiKey('<test token>'); $amount = 100; $card = $_POST['stripeToken']; // Create a Customer $customer = \Stripe\Customer::create(array( "source" => $card, "email" => $email, "description" => "Example description") ); // Charge the Customer instead of the card $charge = \Stripe\Charge::create(array( "amount" => 100, "currency" => "usd", "customer" => $customer->id) ); // Save the billing info set_billing([ 'customer_id' => $customer->id, 'address' => $address, 'address2' => $address2, 'city' => $city, 'state' => $state, 'country' => $country, 'postal' => $postal, 'trans_id' => $charge->id // Save the transaction id ]); function set_billing($fields = array()) { $bdate = time(); $query = "INSERT INTO billings ( customer_id, address, address2, city, state, postal, country, billing_date, trans_id ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"; $stmt = $GLOBALS['sqlConnection']->prepare($query); $stmt->bind_param( 'sssssssis', $fields['customer_id'], $fields['address'], $fields['address2'], $fields['city'], $fields['state'], $fields['postal'], $fields['country'], $bdate, $fields['trans_id']); $stmt->execute(); } // If successful, redirect to thank you page header('Location: /thankyou.php?id=' . $user_id); exit; 

thankyou.php

 <?php $s = $sql->prepare('SELECT trans_id FROM billings WHERE user_id = ?'); $s->bind_param('i', $_GET['id']); $s->execute(); $s->bind_result($trans_id); $s->fetch(); ?> <ul> <li>Transaction id: <?php echo $trans_id ?></li> </ul> 

Есть ли проблемы с моим кодом?