“wpcargo_shipment_history_header” hook is used to add header in the shipment history table. Note: It accepts 1 parameter for shipment information.

Copy and paste this sample code in the theme functions.php file.

function wpcargo_shipment_history_header_callback($shipment){ ?>
	<th class="tbl-sh-action">Custom Header</th>
<?php
}

add_action('wpcargo_shipment_history_header', 'wpcargo_shipment_history_header_callback', 10, 1);

Screenshot: