woocommerce_wp_text_input(
                    array(
                        'id'                => "variable_download_expiry{$loop}",
                        'name'              => "variable_download_expiry[{$loop}]",
                        'value'             => $variation_object->get_download_expiry( 'edit' ) < 0 ? '' : $variation_object->get_download_expiry( 'edit' ),