WCFM Marketplace by WC Lovers

URL del plugin: https://wordpress.org/plugins/wc-multivendor-marketplace/

en el archivo wp-content/plugins/wc-multivendor-marketplace\core\class-wcfmmp-commission.php agrega el siguiente código:

if (class_exists('WOOCS')) {
    global $WOOCS;
    $_order_currency = get_post_meta($order_id, '_order_currency', true);
    $order_rate = get_post_meta($order_id, '_woocs_order_rate', true);
    $currencies = $WOOCS->get_currencies();
    if (!$order_rate) {
        if (isset($currencies[$_order_currency])) {
            $order_rate = $currencies[$_order_currency]['rate'];
        }
    }
    if ($order_rate) {
        $commission_amount = $WOOCS->back_convert($commission_amount, $order_rate, 2);
    }
}

Referencia de shortcodes, funciones, acciones y filtros de FOX WooCommerce Currency Switcher