add_action('woocommerce_thankyou', 'woocommerce_thankyou_adwords_conversions');

function woocommerce_thankyou_adwords_conversions() {
    if (!$order_id)
        return;
    $order = wc_get_order($order_id);
    if ($order) {
        $order_id = $order->get_id();
        $order_total = $order->get_total();
    ?>
    <!-- Event snippet for Purchase conversion page -->
    <script>
        gtag('event', 'conversion', {
                'send_to': 'AW-10862885160/tU92CL6L5qkDEKjy6bso',
                'value': '<?= $order_total ?>',
                'currency': 'RON',
                'transaction_id': '<?= $order_id ?>'
            });
    </script>
    <?php
    }
}