test thank you page

<?php 
    $order = wc_get_order($order);
    $ot = $order->order_total;
    $os = $order->order_shipping;
    $final = $ot-$os-$otax;
    $coupons = $order->get_items('coupon');
    $PromoCode = '';
    foreach($coupons as $coupon)
        {
        $PromoCode = $coupon['name'];
        break;
        }
 ?>
<script>
function hideIF() {
document.getElementById('IF').style.display = '';
}
function getSaleInfo() {
document.getElementById('st_code').innerHTML='<iframe src="https://iceelements.ositracker.com/sales/salejs/amount:<?php
    echo $final; ?>/transaction:<?php
    echo $order->id ?>/PromoCode:<?php
    echo $PromoCode ?>" alt="" id=IF width=50 height=50 border="0" frameborder="0" onload="hideIF()">';
}
window.onload = getSaleInfo;
</script>
<div id="st_code"></div>