public static function add_new_attribute() {
		check_ajax_referer( 'add-attribute', 'security' );

		if ( current_user_can( 'manage_product_terms' ) && isset( $_POST['taxonomy'], $_POST['term'] ) ) {
			$taxonomy = esc_attr( wp_unslash( $_POST['taxonomy'] ) ); // phpcs:ignore
			$term     = wc_clean( wp_unslash( $_POST['term'] ) );

			if ( taxonomy_exists( $taxonomy ) ) {

				$result = wp_insert_term( $term, $taxonomy );

				if ( is_wp_error( $result ) ) {
					wp_send_json(
						array(
							'error' => $result->get_error_message(),
						)
					);
				} else {
					$term = get_term_by( 'id', $result['term_id'], $taxonomy );
					wp_send_json(
						array(
							'term_id' => $term->term_id,
							'name'    => $term->name,
							'slug'    => $term->slug,
						)
					);
				}
			}
		}
		wp_die( -1 );
	}