public function hook() {
		parent::hook();

		add_filter( 'tribe_tickets_attendee_registration_checkout_url', [ $this, 'maybe_filter_attendee_registration_checkout_url' ], 9 );
		add_filter( 'tribe_tickets_tickets_in_cart', [ $this, 'get_tickets_in_cart' ] );
		add_filter( 'tribe_providers_in_cart', [ $this, 'providers_in_cart' ], 11 );
	}