public function register_routes( $routes ) {

		# GET /reports
		$routes[ $this->base ] = array(
			array( array( $this, 'get_reports' ),     WC_API_Server::READABLE ),
		);

		# GET /reports/sales
		$routes[ $this->base . '/sales' ] = array(
			array( array( $this, 'get_sales_report' ), WC_API_Server::READABLE ),
		);

		# GET /reports/sales/top_sellers
		$routes[ $this->base . '/sales/top_sellers' ] = array(
			array( array( $this, 'get_top_sellers_report' ), WC_API_Server::READABLE ),
		);

		return $routes;
	}