public function __construct() {

		add_action( 'init', array( $this, 'add_endpoints' ) );

		if ( ! is_admin() ) {

			add_filter( 'query_vars', array( $this, 'set_query_vars' ), 0 );
			add_action( 'parse_request', array( $this, 'parse_request' ), 0 );
			add_action( 'wp', array( $this, 'maybe_404_certificate' ), 50 );
			add_action( 'wp', array( $this, 'maybe_redirect_certificate' ), 50 );

		}

		$this->init_query_vars();

		add_action( 'pre_get_posts', array( $this, 'pre_get_posts' ), 15 );

	}