A shortcode snippet prepare to output shipment tracking UI on WooCommerce Thank You page.

woocommerce_shipment_tracking_front_output_xlplugin.php

<?php
/**
 * Shortcode snippet prepare to output shipment tracking UI on WooCommerce Thank You page.
 * Required: WooCommerce Shipment Tracking - https://woocommerce.com/products/shipment-tracking/
 * Required: NextMove - WooCommerce Thank You Page - xlplugins.com/woocommerce-thank-you-page-nextmove/
 */
function wc_shipment_tracking_by_xlplugin($atts) {
    if (isset($_REQUEST['order_id']) && $_REQUEST['order_id'] != '') {
        $html = '';
        $order_id = $_REQUEST['order_id'];        
        if (function_exists('XLWCTY_Core')) {            
            $order = XLWCTY_Core()->data->get_order();            
            if ($order instanceof WC_Order) {                
                $st = new WC_Shipment_Tracking_Actions();
                ob_start();
		echo '<style>.xlwcty_Box h2{font-size:20px;line-height:26px}</style>';
                $st->display_tracking_info($order_id);
                $html = ob_get_clean();
            }
        }
    }

    return $html;
}

add_shortcode('xl_shipment_tracking', 'wc_shipment_tracking_by_xlplugin');