Change the MB WAY to Multibanco recover order email subject on Multibanco, MB WAY, Credit card, Payshop and Cofidis Pay (IfthenPay) for WooCommerce - PRO add-on

wc_ifthenpay_mbway_convertmb_expired_orders_email_subject.php

<?php
add_filter( 'wc_ifthenpay_mbway_convertmb_expired_orders_email_subject', function( $subject, $order ) {
	return 'Enc. #' . $order->get_id() . ' - Última oportunidade para efetuares o pagamento!';
}, 10, 2 );