protected function send_ajax_failure_response() {
		if ( is_ajax() ) {
			// Only print notices if not reloading the checkout, otherwise they're lost in the page reload.
			if ( ! isset( WC()->session->reload_checkout ) ) {
				$messages = wc_print_notices( true );
			}

			$response = array(
				'result'   => 'failure',
				'messages' => isset( $messages ) ? $messages : '',
				'refresh'  => isset( WC()->session->refresh_totals ),
				'reload'   => isset( WC()->session->reload_checkout ),
			);

			unset( WC()->session->refresh_totals, WC()->session->reload_checkout );

			wp_send_json( $response );
		}
	}