WooCommerce Plugin: Order Details on "Thank You" Page As Global JavaScript variables

woo-orderdetails-on-thankyou-page.php

<?php
/**
 * Plugin Name: Order Details on Thank You Page
 * Version: 1.0
 * Author: Rias A. Sherzad
 * Description: This plugin will export some order details on the thank you page as global JavaScript variables, e.g. for accessing them from Google Tag Manager
 */
if (!defined('ABSPATH'))
{
    exit;
}

function woo_OrderDetailsOnThankYouPage($order_id)
{
    // Load the order
    $order = wc_get_order( $order_id );

    ?>
    <script type="text/javascript">
          var woo_order_key = '<?= $order->get_order_key() ?>';
          var woo_order_currency = '<?= $order->get_data()['currency'] ?>';
          var woo_order_total_net = '<?= ($order->get_data()['total'] - $order->get_data()['total_tax']) ?>';
    </script>
    <?php
}

add_action('woocommerce_thankyou', 'woo_OrderDetailsOnThankYouPage', 10, 1);
?>