Fortnox - Set Customer type (GUEST)

functions.php

<?php
 /**
 * @snippet       WooCommerce - Fortnox plugin by Redlight Media - (GUEST USERS) Set customer Type to Private
 * @author        Redlight Media AB / Christopher Hedqvist
 * @compatible    WooCommerce 3.4.2
 */
function redlight_fortnox_guest_customer_type( $customer, $order_id ) {
    $customer['Customer']['Type'] = 'PRIVATE';
        
    return $customer;
}
add_filter( 'obj_fortnox_guest_customer_data', 'redlight_fortnox_guest_customer_type', 10, 2 );