public function includes() {

		// API server / response handlers.
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-exception.php' );
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-server.php' );
		include_once( dirname( __FILE__ ) . '/api/v3/interface-wc-api-handler.php' );
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-json-handler.php' );

		// Authentication.
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-authentication.php' );
		$this->authentication = new WC_API_Authentication();

		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-resource.php' );
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-coupons.php' );
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-customers.php' );
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-orders.php' );
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-products.php' );
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-reports.php' );
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-taxes.php' );
		include_once( dirname( __FILE__ ) . '/api/v3/class-wc-api-webhooks.php' );

		// Allow plugins to load other response handlers or resource classes.
		do_action( 'woocommerce_api_loaded' );
	}