public static function add_order_shipping() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		$response = array();

		try {
			$order_id = isset( $_POST['order_id'] ) ? absint( $_POST['order_id'] ) : 0;
			$order    = wc_get_order( $order_id );

			if ( ! $order ) {
				throw new Exception( __( 'Invalid order', 'woocommerce' ) );
			}

			$order_taxes      = $order->get_taxes();
			$shipping_methods = WC()->shipping() ? WC()->shipping()->load_shipping_methods() : array();

			// Add new shipping.
			$item = new WC_Order_Item_Shipping();
			$item->set_shipping_rate( new WC_Shipping_Rate() );
			$item->set_order_id( $order_id );
			$item_id = $item->save();

			ob_start();
			include 'admin/meta-boxes/views/html-order-shipping.php';
			$response['html'] = ob_get_clean();
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}