<?php
$subject = "Your Order #{$order_id} has been shipped!";
$order_details_link = get_site_url() . '/order_details.php?id=' . $order_id;
?>
<p>Great news! Your order #<?php echo $order_id; ?> has been shipped.</p>
<p>You can track your order and view details here: <a href="<?php echo $order_details_link; ?>"><?php echo $order_details_link; ?></a></p>
