actualityextensions

<?php
// Support to pass through information to POS receipt footer

add_filter( 'wc_pos_receipt_footer_text', 'change_pos_receipt_footer_text', 10, 3 );

function change_pos_receipt_footer_text( $footer_text, $order, $register ) {
    $footer_text = 'This is a waranty summary.';
    return $footer_text;
}

actualityextensions

<?php
// Support to pass through information to POS receipt header

add_filter( 'wc_pos_receipt_header_text', 'change_pos_receipt_header_text', 10, 3 );

function change_pos_receipt_header_text( $header_text, $order, $register ) {
    $header_text = 'This is an updated header text.';
    return $header_text;
}