public function save() {

		if ( ! isset( $_REQUEST['_wpnonce'] ) ) {
			return;
		}
		if ( ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_REQUEST['_wpnonce'] ) ), 'lifterlms-settings' ) ) {
			return;
		}

		// Save all custom fields.
		parent::save();

		// Save display order of gateways.
		foreach ( llms()->payment_gateways()->get_payment_gateways() as $id => $gateway ) {
			$option = $gateway->get_option_name( 'display_order' );
			if ( isset( $_POST[ $option ] ) ) {
				update_option( $option, absint( $_POST[ $option ] ) );
			}
		}
	}