portugal_ctt_tracking_email_info

portugal_ctt_tracking_email_info.php

<?php
add_filter( 'portugal_ctt_tracking_email_info', 'my_portugal_ctt_tracking_email_info', 10, 4 );
function my_portugal_ctt_tracking_email_info( $html, $order_object, $sent_to_admin, $plain_text ) {
	//Do whatever you want with the HTML
	//You can get the tracking code with $order_object->get_meta( '_ctt_tracking_code' )
	return $html;
}