$filter_names = array(
            'product_id'      => __( 'Product', 'woocommerce' ),
            'download_id'     => __( 'File ID', 'woocommerce' ),
            'permission_id'   => __( 'Permission ID', 'woocommerce' ),
            'order_id'        => __( 'Order', 'woocommerce' ),