public static function ajax_request() {

		$args = wp_parse_args( $_REQUEST, array(
			'event'  => null,
			'pid'    => null,
			'method' => null,
		) );

		self::track( $args );

		switch ( $args['method'] ) {
			case 'image':
				self::serve_pixel();
				break;

			case 'json':
				self::serve_json();
				break;

			default:
				self::serve_no_content();
				break;
		}

	}