woothemes/woocommerce

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includes/rest-api/Controllers/Version2/class-wc-rest-orders-v2-controller.php

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<?php
/**
 * REST API Orders controller
 *
 * Handles requests to the /orders endpoint.
 *
 * @package WooCommerce\RestApi
 * @since    2.6.0
 */

defined( 'ABSPATH' ) || exit;

/**
 * REST API Orders controller class.
 *
 * @package WooCommerce\RestApi
 * @extends WC_REST_CRUD_Controller
 */
class WC_REST_Orders_V2_Controller extends WC_REST_CRUD_Controller {

    /**
     * Endpoint namespace.
     *
     * @var string
     */
    protected $namespace = 'wc/v2';

    /**
     * Route base.
     *
     * @var string
     */
    protected $rest_base = 'orders';

    /**
     * Post type.
     *
     * @var string
     */
    protected $post_type = 'shop_order';

    /**
     * If object is hierarchical.
     *
     * @var bool
     */
    protected $hierarchical = true;

    /**
     * Stores the request.
     *
     * @var array
     */
    protected $request = array();

    /**
     * Register the routes for orders.
     */
    public function register_routes() {
        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base,
            array(
                array(
                    'methods'             => WP_REST_Server::READABLE,
                    'callback'            => array( $this, 'get_items' ),
                    'permission_callback' => array( $this, 'get_items_permissions_check' ),
                    'args'                => $this->get_collection_params(),
                ),
                array(
                    'methods'             => WP_REST_Server::CREATABLE,
                    'callback'            => array( $this, 'create_item' ),
                    'permission_callback' => array( $this, 'create_item_permissions_check' ),
                    'args'                => $this->get_endpoint_args_for_item_schema( WP_REST_Server::CREATABLE ),
                ),
                'schema' => array( $this, 'get_public_item_schema' ),
            )
        );

        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/(?P<id>[\d]+)',
            array(
                'args'   => array(
                    'id' => array(
                        'description' => __( 'Unique identifier for the resource.', 'woocommerce' ),
                        'type'        => 'integer',
                    ),
                ),
                array(
                    'methods'             => WP_REST_Server::READABLE,
                    'callback'            => array( $this, 'get_item' ),
                    'permission_callback' => array( $this, 'get_item_permissions_check' ),
                    'args'                => array(
                        'context' => $this->get_context_param( array( 'default' => 'view' ) ),
                    ),
                ),
                array(
                    'methods'             => WP_REST_Server::EDITABLE,
                    'callback'            => array( $this, 'update_item' ),
                    'permission_callback' => array( $this, 'update_item_permissions_check' ),
                    'args'                => $this->get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),
                ),
                array(
                    'methods'             => WP_REST_Server::DELETABLE,
                    'callback'            => array( $this, 'delete_item' ),
                    'permission_callback' => array( $this, 'delete_item_permissions_check' ),
                    'args'                => array(
                        'force' => array(
                            'default'     => false,
                            'type'        => 'boolean',
                            'description' => __( 'Whether to bypass trash and force deletion.', 'woocommerce' ),
                        ),
                    ),
                ),
                'schema' => array( $this, 'get_public_item_schema' ),
            )
        );

        register_rest_route(
            $this->namespace,
            '/' . $this->rest_base . '/batch',
            array(
                array(
                    'methods'             => WP_REST_Server::EDITABLE,
                    'callback'            => array( $this, 'batch_items' ),
                    'permission_callback' => array( $this, 'batch_items_permissions_check' ),
                    'args'                => $this->get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),
                ),
                'schema' => array( $this, 'get_public_batch_schema' ),
            )
        );
    }

    /**
     * Get object. Return false if object is not of required type.
     *
     * @since  3.0.0
     * @param  int $id Object ID.
     * @return WC_Data|bool
     */
    protected function get_object( $id ) {
        $order = wc_get_order( $id );
        // In case id is a refund's id (or it's not an order at all), don't expose it via /orders/ path.
        if ( ! $order || 'shop_order_refund' === $order->get_type() ) {
            return false;
        }

        return $order;
    }

    /**
     * Expands an order item to get its data.
     *
     * @param WC_Order_item $item Order item data.
     * @return array
     */
    protected function get_order_item_data( $item ) {
        $data           = $item->get_data();
        $format_decimal = array( 'subtotal', 'subtotal_tax', 'total', 'total_tax', 'tax_total', 'shipping_tax_total' );

        // Format decimal values.
        foreach ( $format_decimal as $key ) {
            if ( isset( $data[ $key ] ) ) {
                $data[ $key ] = wc_format_decimal( $data[ $key ], $this->request['dp'] );
            }
        }

        // Add SKU and PRICE to products.
        if ( is_callable( array( $item, 'get_product' ) ) ) {
            $data['sku']   = $item->get_product() ? $item->get_product()->get_sku() : null;
            $data['price'] = $item->get_quantity() ? $item->get_total() / $item->get_quantity() : 0;
        }

        // Add parent_name if the product is a variation.
        if ( is_callable( array( $item, 'get_product' ) ) ) {
            $product = $item->get_product();

            if ( is_callable( array( $product, 'get_parent_data' ) ) ) {
                $data['parent_name'] = $product->get_title();
            } else {
                $data['parent_name'] = null;
            }
        }

        // Format taxes.
        if ( ! empty( $data['taxes']['total'] ) ) {
            $taxes = array();

            foreach ( $data['taxes']['total'] as $tax_rate_id => $tax ) {
                $taxes[] = array(
                    'id'       => $tax_rate_id,
                    'total'    => $tax,
                    'subtotal' => isset( $data['taxes']['subtotal'][ $tax_rate_id ] ) ? $data['taxes']['subtotal'][ $tax_rate_id ] : '',
                );
            }
            $data['taxes'] = $taxes;
        } elseif ( isset( $data['taxes'] ) ) {
            $data['taxes'] = array();
        }

        // Remove names for coupons, taxes and shipping.
        if ( isset( $data['code'] ) || isset( $data['rate_code'] ) || isset( $data['method_title'] ) ) {
            unset( $data['name'] );
        }

        // Remove props we don't want to expose.
        unset( $data['order_id'] );
        unset( $data['type'] );

        // Expand meta_data to include user-friendly values.
        $formatted_meta_data = $item->get_formatted_meta_data( null, true );
        $data['meta_data'] = array_map(
            array( $this, 'merge_meta_item_with_formatted_meta_display_attributes' ),
            $data['meta_data'],
            array_fill( 0, count( $data['meta_data'] ), $formatted_meta_data )
        );

        return $data;
    }

    /**
     * Merge the `$formatted_meta_data` `display_key` and `display_value` attribute values into the corresponding
     * {@link WC_Meta_Data}. Returns the merged array.
     *
     * @param WC_Meta_Data $meta_item           An object from {@link WC_Order_Item::get_meta_data()}.
     * @param array        $formatted_meta_data An object result from {@link WC_Order_Item::get_formatted_meta_data}.
     * The keys are the IDs of {@link WC_Meta_Data}.
     *
     * @return array
     */
    private function merge_meta_item_with_formatted_meta_display_attributes( $meta_item, $formatted_meta_data ) {
        $result = array(
            'id'            => $meta_item->id,
            'key'           => $meta_item->key,
            'value'         => $meta_item->value,
            'display_key'   => $meta_item->key,   // Default to original key, in case a formatted key is not available.
            'display_value' => $meta_item->value, // Default to original value, in case a formatted value is not available.
        );

        if ( array_key_exists( $meta_item->id, $formatted_meta_data ) ) {
            $formatted_meta_item = $formatted_meta_data[ $meta_item->id ];

            $result['display_key'] = wc_clean( $formatted_meta_item->display_key );
            $result['display_value'] = wc_clean( $formatted_meta_item->display_value );
        }

        return $result;
    }

    /**
     * Get formatted item data.
     *
     * @since 3.0.0
     * @param WC_Order $order WC_Data instance.
     *
     * @return array
     */
    protected function get_formatted_item_data( $order ) {
        $extra_fields      = array( 'meta_data', 'line_items', 'tax_lines', 'shipping_lines', 'fee_lines', 'coupon_lines', 'refunds' );
        $format_decimal    = array( 'discount_total', 'discount_tax', 'shipping_total', 'shipping_tax', 'shipping_total', 'shipping_tax', 'cart_tax', 'total', 'total_tax' );
        $format_date       = array( 'date_created', 'date_modified', 'date_completed', 'date_paid' );
        // These fields are dependent on other fields.
        $dependent_fields = array(
            'date_created_gmt'   => 'date_created',
            'date_modified_gmt'  => 'date_modified',
            'date_completed_gmt' => 'date_completed',
            'date_paid_gmt'      => 'date_paid',
        );

        $format_line_items = array( 'line_items', 'tax_lines', 'shipping_lines', 'fee_lines', 'coupon_lines' );

        // Only fetch fields that we need.
        $fields = $this->get_fields_for_response( $this->request );
        foreach ( $dependent_fields as $field_key => $dependency ) {
            if ( in_array( $field_key, $fields ) && ! in_array( $dependency, $fields ) ) {
                $fields[] = $dependency;
            }
        }

        $extra_fields      = array_intersect( $extra_fields, $fields );
        $format_decimal    = array_intersect( $format_decimal, $fields );
        $format_date       = array_intersect( $format_date, $fields );

        $format_line_items = array_intersect( $format_line_items, $fields );

        $data = $order->get_base_data();

        // Add extra data as necessary.
        foreach ( $extra_fields as $field ) {
            switch ( $field ) {
                case 'meta_data':
                    $data['meta_data'] = $order->get_meta_data();
                    break;
                case 'line_items':
                    $data['line_items'] = $order->get_items( 'line_item' );
                    break;
                case 'tax_lines':
                    $data['tax_lines'] = $order->get_items( 'tax' );
                    break;
                case 'shipping_lines':
                    $data['shipping_lines'] = $order->get_items( 'shipping' );
                    break;
                case 'fee_lines':
                    $data['fee_lines'] = $order->get_items( 'fee' );
                    break;
                case 'coupon_lines':
                    $data['coupon_lines'] = $order->get_items( 'coupon' );
                    break;
                case 'refunds':
                    $data['refunds'] = array();
                    foreach ( $order->get_refunds() as $refund ) {
                        $data['refunds'][] = array(
                            'id'     => $refund->get_id(),
                            'reason' => $refund->get_reason() ? $refund->get_reason() : '',
                            'total'  => '-' . wc_format_decimal( $refund->get_amount(), $this->request['dp'] ),
                        );
                    }
                    break;
            }
        }

        // Format decimal values.
        foreach ( $format_decimal as $key ) {
            $data[ $key ] = wc_format_decimal( $data[ $key ], $this->request['dp'] );
        }

        // Format date values.
        foreach ( $format_date as $key ) {
            $datetime              = $data[ $key ];
            $data[ $key ]          = wc_rest_prepare_date_response( $datetime, false );
            $data[ $key . '_gmt' ] = wc_rest_prepare_date_response( $datetime );
        }

        // Format the order status.
        $data['status'] = 'wc-' === substr( $data['status'], 0, 3 ) ? substr( $data['status'], 3 ) : $data['status'];

        // Format line items.
        foreach ( $format_line_items as $key ) {
            $data[ $key ] = array_values( array_map( array( $this, 'get_order_item_data' ), $data[ $key ] ) );
        }

        $allowed_fields = array(
            'id',
            'parent_id',
            'number',
            'order_key',
            'created_via',
            'version',
            'status',
            'currency',
            'date_created',
            'date_created_gmt',
            'date_modified',
            'date_modified_gmt',
            'discount_total',
            'discount_tax',
            'shipping_total',
            'shipping_tax',
            'cart_tax',
            'total',
            'total_tax',
            'prices_include_tax',
            'customer_id',
            'customer_ip_address',
            'customer_user_agent',
            'customer_note',
            'billing',
            'shipping',
            'payment_method',
            'payment_method_title',
            'transaction_id',
            'date_paid',
            'date_paid_gmt',
            'date_completed',
            'date_completed_gmt',
            'cart_hash',
            'meta_data',
            'line_items',
            'tax_lines',
            'shipping_lines',
            'fee_lines',
            'coupon_lines',
            'refunds',
        );

        $data = array_intersect_key( $data, array_flip( $allowed_fields ) );

        return $data;
    }

    /**
     * Prepare a single order output for response.
     *
     * @since  3.0.0
     * @param  WC_Data         $object  Object data.
     * @param  WP_REST_Request $request Request object.
     * @return WP_REST_Response
     */
    public function prepare_object_for_response( $object, $request ) {
        $this->request       = $request;
        $this->request['dp'] = is_null( $this->request['dp'] ) ? wc_get_price_decimals() : absint( $this->request['dp'] );
        $request['context']  = ! empty( $request['context'] ) ? $request['context'] : 'view';
        $data                = $this->get_formatted_item_data( $object );
        $data                = $this->add_additional_fields_to_object( $data, $request );
        $data                = $this->filter_response_by_context( $data, $request['context'] );
        $response            = rest_ensure_response( $data );
        $response->add_links( $this->prepare_links( $object, $request ) );

        /**
         * Filter the data for a response.
         *
         * The dynamic portion of the hook name, $this->post_type,
         * refers to object type being prepared for the response.
         *
         * @param WP_REST_Response $response The response object.
         * @param WC_Data          $object   Object data.
         * @param WP_REST_Request  $request  Request object.
         */
        return apply_filters( "woocommerce_rest_prepare_{$this->post_type}_object", $response, $object, $request );
    }

    /**
     * Prepare links for the request.
     *
     * @param WC_Data         $object  Object data.
     * @param WP_REST_Request $request Request object.
     * @return array                   Links for the given post.
     */
    protected function prepare_links( $object, $request ) {
        $links = array(
            'self'       => array(
                'href' => rest_url( sprintf( '/%s/%s/%d', $this->namespace, $this->rest_base, $object->get_id() ) ),
            ),
            'collection' => array(
                'href' => rest_url( sprintf( '/%s/%s', $this->namespace, $this->rest_base ) ),
            ),
        );

        if ( 0 !== (int) $object->get_customer_id() ) {
            $links['customer'] = array(
                'href' => rest_url( sprintf( '/%s/customers/%d', $this->namespace, $object->get_customer_id() ) ),
            );
        }

        if ( 0 !== (int) $object->get_parent_id() ) {
            $links['up'] = array(
                'href' => rest_url( sprintf( '/%s/orders/%d', $this->namespace, $object->get_parent_id() ) ),
            );
        }

        return $links;
    }

    /**
     * Prepare objects query.
     *
     * @since  3.0.0
     * @param  WP_REST_Request $request Full details about the request.
     * @return array
     */
    protected function prepare_objects_query( $request ) {
        global $wpdb;

        $args = parent::prepare_objects_query( $request );

        // Set post_status.
        if ( in_array( $request['status'], $this->get_order_statuses(), true ) ) {
            $args['post_status'] = 'wc-' . $request['status'];
        } elseif ( 'any' === $request['status'] ) {
            $args['post_status'] = 'any';
        } else {
            $args['post_status'] = $request['status'];
        }

        if ( isset( $request['customer'] ) ) {
            if ( ! empty( $args['meta_query'] ) ) {
                $args['meta_query'] = array(); // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
            }

            $args['meta_query'][] = array(
                'key'   => '_customer_user',
                'value' => $request['customer'],
                'type'  => 'NUMERIC',
            );
        }

        // Search by product.
        if ( ! empty( $request['product'] ) ) {
            $order_ids = $wpdb->get_col(
                $wpdb->prepare(
                    "SELECT order_id
                    FROM {$wpdb->prefix}woocommerce_order_items
                    WHERE order_item_id IN ( SELECT order_item_id FROM {$wpdb->prefix}woocommerce_order_itemmeta WHERE meta_key = '_product_id' AND meta_value = %d )
                    AND order_item_type = 'line_item'",
                    $request['product']
                )
            );

            // Force WP_Query return empty if don't found any order.
            $order_ids = ! empty( $order_ids ) ? $order_ids : array( 0 );

            $args['post__in'] = $order_ids;
        }

        // Search.
        if ( ! empty( $args['s'] ) ) {
            $order_ids = wc_order_search( $args['s'] );

            if ( ! empty( $order_ids ) ) {
                unset( $args['s'] );
                $args['post__in'] = array_merge( $order_ids, array( 0 ) );
            }
        }

        /**
         * Filter the query arguments for a request.
         *
         * Enables adding extra arguments or setting defaults for an order collection request.
         *
         * @param array           $args    Key value array of query var to query value.
         * @param WP_REST_Request $request The request used.
         */
        $args = apply_filters( 'woocommerce_rest_orders_prepare_object_query', $args, $request );

        return $args;
    }

    /**
     * Only return writable props from schema.
     *
     * @param  array $schema Schema.
     * @return bool
     */
    protected function filter_writable_props( $schema ) {
        return empty( $schema['readonly'] );
    }

    /**
     * Prepare a single order for create or update.
     *
     * @param  WP_REST_Request $request Request object.
     * @param  bool            $creating If is creating a new object.
     * @return WP_Error|WC_Data
     */
    protected function prepare_object_for_database( $request, $creating = false ) {
        $id        = isset( $request['id'] ) ? absint( $request['id'] ) : 0;
        $order     = new WC_Order( $id );
        $schema    = $this->get_item_schema();
        $data_keys = array_keys( array_filter( $schema['properties'], array( $this, 'filter_writable_props' ) ) );

        // Handle all writable props.
        foreach ( $data_keys as $key ) {
            $value = $request[ $key ];

            if ( ! is_null( $value ) ) {
                switch ( $key ) {
                    case 'status':
                        // Status change should be done later so transitions have new data.
                        break;
                    case 'billing':
                    case 'shipping':
                        $this->update_address( $order, $value, $key );
                        break;
                    case 'line_items':
                    case 'shipping_lines':
                    case 'fee_lines':
                    case 'coupon_lines':
                        if ( is_array( $value ) ) {
                            foreach ( $value as $item ) {
                                if ( is_array( $item ) ) {
                                    if ( $this->item_is_null( $item ) || ( isset( $item['quantity'] ) && 0 === $item['quantity'] ) ) {
                                        $order->remove_item( $item['id'] );
                                    } else {
                                        $this->set_item( $order, $key, $item );
                                    }
                                }
                            }
                        }
                        break;
                    case 'meta_data':
                        if ( is_array( $value ) ) {
                            foreach ( $value as $meta ) {
                                $order->update_meta_data( $meta['key'], $meta['value'], isset( $meta['id'] ) ? $meta['id'] : '' );
                            }
                        }
                        break;
                    default:
                        if ( is_callable( array( $order, "set_{$key}" ) ) ) {
                            $order->{"set_{$key}"}( $value );
                        }
                        break;
                }
            }
        }

        /**
         * Filters an object before it is inserted via the REST API.
         *
         * The dynamic portion of the hook name, `$this->post_type`,
         * refers to the object type slug.
         *
         * @param WC_Data         $order    Object object.
         * @param WP_REST_Request $request  Request object.
         * @param bool            $creating If is creating a new object.
         */
        return apply_filters( "woocommerce_rest_pre_insert_{$this->post_type}_object", $order, $request, $creating );
    }

    /**
     * Save an object data.
     *
     * @since  3.0.0
     * @throws WC_REST_Exception But all errors are validated before returning any data.
     * @param  WP_REST_Request $request  Full details about the request.
     * @param  bool            $creating If is creating a new object.
     * @return WC_Data|WP_Error
     */
    protected function save_object( $request, $creating = false ) {
        try {
            $object = $this->prepare_object_for_database( $request, $creating );

            if ( is_wp_error( $object ) ) {
                return $object;
            }

            // Make sure gateways are loaded so hooks from gateways fire on save/create.
            WC()->payment_gateways();

            if ( ! is_null( $request['customer_id'] ) && 0 !== $request['customer_id'] ) {
                // Make sure customer exists.
                if ( false === get_user_by( 'id', $request['customer_id'] ) ) {
                    throw new WC_REST_Exception( 'woocommerce_rest_invalid_customer_id', __( 'Customer ID is invalid.', 'woocommerce' ), 400 );
                }

                // Make sure customer is part of blog.
                if ( is_multisite() && ! is_user_member_of_blog( $request['customer_id'] ) ) {
                    add_user_to_blog( get_current_blog_id(), $request['customer_id'], 'customer' );
                }
            }

            if ( $creating ) {
                $object->set_created_via( 'rest-api' );
                $object->set_prices_include_tax( 'yes' === get_option( 'woocommerce_prices_include_tax' ) );
                $object->calculate_totals();
            } else {
                // If items have changed, recalculate order totals.
                if ( isset( $request['billing'] ) || isset( $request['shipping'] ) || isset( $request['line_items'] ) || isset( $request['shipping_lines'] ) || isset( $request['fee_lines'] ) || isset( $request['coupon_lines'] ) ) {
                    $object->calculate_totals( true );
                }
            }

            // Set status.
            if ( ! empty( $request['status'] ) ) {
                $object->set_status( $request['status'] );
            }

            $object->save();

            // Actions for after the order is saved.
            if ( true === $request['set_paid'] ) {
                if ( $creating || $object->needs_payment() ) {
                    $object->payment_complete( $request['transaction_id'] );
                }
            }

            return $this->get_object( $object->get_id() );
        } catch ( WC_Data_Exception $e ) {
            return new WP_Error( $e->getErrorCode(), $e->getMessage(), $e->getErrorData() );
        } catch ( WC_REST_Exception $e ) {
            return new WP_Error( $e->getErrorCode(), $e->getMessage(), array( 'status' => $e->getCode() ) );
        }
    }

    /**
     * Update address.
     *
     * @param WC_Order $order  Order data.
     * @param array    $posted Posted data.
     * @param string   $type   Address type.
     */
    protected function update_address( $order, $posted, $type = 'billing' ) {
        foreach ( $posted as $key => $value ) {
            if ( is_callable( array( $order, "set_{$type}_{$key}" ) ) ) {
                $order->{"set_{$type}_{$key}"}( $value );
            }
        }
    }

    /**
     * Gets the product ID from the SKU or posted ID.
     *
     * @throws WC_REST_Exception When SKU or ID is not valid.
     * @param array  $posted Request data.
     * @param string $action 'create' to add line item or 'update' to update it.
     * @return int
     */
    protected function get_product_id( $posted, $action = 'create' ) {
        if ( ! empty( $posted['sku'] ) ) {
            $product_id = (int) wc_get_product_id_by_sku( $posted['sku'] );
        } elseif ( ! empty( $posted['product_id'] ) && empty( $posted['variation_id'] ) ) {
            $product_id = (int) $posted['product_id'];
        } elseif ( ! empty( $posted['variation_id'] ) ) {
            $product_id = (int) $posted['variation_id'];
        } elseif ( 'update' === $action ) {
            $product_id = 0;
        } else {
            throw new WC_REST_Exception( 'woocommerce_rest_required_product_reference', __( 'Product ID or SKU is required.', 'woocommerce' ), 400 );
        }
        return $product_id;
    }

    /**
     * Maybe set an item prop if the value was posted.
     *
     * @param WC_Order_Item $item   Order item.
     * @param string        $prop   Order property.
     * @param array         $posted Request data.
     */
    protected function maybe_set_item_prop( $item, $prop, $posted ) {
        if ( isset( $posted[ $prop ] ) ) {
            $item->{"set_$prop"}( $posted[ $prop ] );
        }
    }

    /**
     * Maybe set item props if the values were posted.
     *
     * @param WC_Order_Item $item   Order item data.
     * @param string[]      $props  Properties.
     * @param array         $posted Request data.
     */
    protected function maybe_set_item_props( $item, $props, $posted ) {
        foreach ( $props as $prop ) {
            $this->maybe_set_item_prop( $item, $prop, $posted );
        }
    }

    /**
     * Maybe set item meta if posted.
     *
     * @param WC_Order_Item $item   Order item data.
     * @param array         $posted Request data.
     */
    protected function maybe_set_item_meta_data( $item, $posted ) {
        if ( ! empty( $posted['meta_data'] ) && is_array( $posted['meta_data'] ) ) {
            foreach ( $posted['meta_data'] as $meta ) {
                if ( isset( $meta['key'] ) ) {
                    $value = isset( $meta['value'] ) ? $meta['value'] : null;
                    $item->update_meta_data( $meta['key'], $value, isset( $meta['id'] ) ? $meta['id'] : '' );
                }
            }
        }
    }

    /**
     * Create or update a line item.
     *
     * @param array  $posted Line item data.
     * @param string $action 'create' to add line item or 'update' to update it.
     * @param object $item Passed when updating an item. Null during creation.
     * @return WC_Order_Item_Product
     * @throws WC_REST_Exception Invalid data, server error.
     */
    protected function prepare_line_items( $posted, $action = 'create', $item = null ) {
        $item    = is_null( $item ) ? new WC_Order_Item_Product( ! empty( $posted['id'] ) ? $posted['id'] : '' ) : $item;
        $product = wc_get_product( $this->get_product_id( $posted, $action ) );

        if ( $product && $product !== $item->get_product() ) {
            $item->set_product( $product );

            if ( 'create' === $action ) {
                $quantity = isset( $posted['quantity'] ) ? $posted['quantity'] : 1;
                $total    = wc_get_price_excluding_tax( $product, array( 'qty' => $quantity ) );
                $item->set_total( $total );
                $item->set_subtotal( $total );
            }
        }

        $this->maybe_set_item_props( $item, array( 'name', 'quantity', 'total', 'subtotal', 'tax_class' ), $posted );
        $this->maybe_set_item_meta_data( $item, $posted );

        return $item;
    }

    /**
     * Create or update an order shipping method.
     *
     * @param array  $posted $shipping Item data.
     * @param string $action 'create' to add shipping or 'update' to update it.
     * @param object $item Passed when updating an item. Null during creation.
     * @return WC_Order_Item_Shipping
     * @throws WC_REST_Exception Invalid data, server error.
     */
    protected function prepare_shipping_lines( $posted, $action = 'create', $item = null ) {
        $item = is_null( $item ) ? new WC_Order_Item_Shipping( ! empty( $posted['id'] ) ? $posted['id'] : '' ) : $item;

        if ( 'create' === $action ) {
            if ( empty( $posted['method_id'] ) ) {
                throw new WC_REST_Exception( 'woocommerce_rest_invalid_shipping_item', __( 'Shipping method ID is required.', 'woocommerce' ), 400 );
            }
        }

        $this->maybe_set_item_props( $item, array( 'method_id', 'method_title', 'total', 'instance_id' ), $posted );
        $this->maybe_set_item_meta_data( $item, $posted );

        return $item;
    }

    /**
     * Create or update an order fee.
     *
     * @param array  $posted Item data.
     * @param string $action 'create' to add fee or 'update' to update it.
     * @param object $item Passed when updating an item. Null during creation.
     * @return WC_Order_Item_Fee
     * @throws WC_REST_Exception Invalid data, server error.
     */
    protected function prepare_fee_lines( $posted, $action = 'create', $item = null ) {
        $item = is_null( $item ) ? new WC_Order_Item_Fee( ! empty( $posted['id'] ) ? $posted['id'] : '' ) : $item;

        if ( 'create' === $action ) {
            if ( empty( $posted['name'] ) ) {
                throw new WC_REST_Exception( 'woocommerce_rest_invalid_fee_item', __( 'Fee name is required.', 'woocommerce' ), 400 );
            }
        }

        $this->maybe_set_item_props( $item, array( 'name', 'tax_class', 'tax_status', 'total' ), $posted );
        $this->maybe_set_item_meta_data( $item, $posted );

        return $item;
    }

    /**
     * Create or update an order coupon.
     *
     * @param array  $posted Item data.
     * @param string $action 'create' to add coupon or 'update' to update it.
     * @param object $item Passed when updating an item. Null during creation.
     * @return WC_Order_Item_Coupon
     * @throws WC_REST_Exception Invalid data, server error.
     */
    protected function prepare_coupon_lines( $posted, $action = 'create', $item = null ) {
        $item = is_null( $item ) ? new WC_Order_Item_Coupon( ! empty( $posted['id'] ) ? $posted['id'] : '' ) : $item;

        if ( 'create' === $action ) {
            if ( empty( $posted['code'] ) ) {
                throw new WC_REST_Exception( 'woocommerce_rest_invalid_coupon_coupon', __( 'Coupon code is required.', 'woocommerce' ), 400 );
            }
        }

        $this->maybe_set_item_props( $item, array( 'code', 'discount' ), $posted );
        $this->maybe_set_item_meta_data( $item, $posted );

        return $item;
    }

    /**
     * Wrapper method to create/update order items.
     * When updating, the item ID provided is checked to ensure it is associated
     * with the order.
     *
     * @param WC_Order $order order object.
     * @param string   $item_type The item type.
     * @param array    $posted item provided in the request body.
     * @throws WC_REST_Exception If item ID is not associated with order.
     */
    protected function set_item( $order, $item_type, $posted ) {
        global $wpdb;

        if ( ! empty( $posted['id'] ) ) {
            $action = 'update';
        } else {
            $action = 'create';
        }

        $method = 'prepare_' . $item_type;
        $item   = null;

        // Verify provided line item ID is associated with order.
        if ( 'update' === $action ) {
            $item = $order->get_item( absint( $posted['id'] ), false );

            if ( ! $item ) {
                throw new WC_REST_Exception( 'woocommerce_rest_invalid_item_id', __( 'Order item ID provided is not associated with order.', 'woocommerce' ), 400 );
            }
        }

        // Prepare item data.
        $item = $this->$method( $posted, $action, $item );

        do_action( 'woocommerce_rest_set_order_item', $item, $posted );

        // If creating the order, add the item to it.
        if ( 'create' === $action ) {
            $order->add_item( $item );
        } else {
            $item->save();
        }
    }

    /**
     * Helper method to check if the resource ID associated with the provided item is null.
     * Items can be deleted by setting the resource ID to null.
     *
     * @param array $item Item provided in the request body.
     * @return bool True if the item resource ID is null, false otherwise.
     */
    protected function item_is_null( $item ) {
        $keys = array( 'product_id', 'method_id', 'method_title', 'name', 'code' );

        foreach ( $keys as $key ) {
            if ( array_key_exists( $key, $item ) && is_null( $item[ $key ] ) ) {
                return true;
            }
        }

        return false;
    }

    /**
     * Get order statuses without prefixes.
     *
     * @return array
     */
    protected function get_order_statuses() {
        $order_statuses = array();

        foreach ( array_keys( wc_get_order_statuses() ) as $status ) {
            $order_statuses[] = str_replace( 'wc-', '', $status );
        }

        return $order_statuses;
    }

    /**
     * Get the Order's schema, conforming to JSON Schema.
     *
     * @return array
     */
    public function get_item_schema() {
        $schema = array(
            '$schema'    => 'http://json-schema.org/draft-04/schema#',
            'title'      => $this->post_type,
            'type'       => 'object',
            'properties' => array(
                'id'                   => array(
                    'description' => __( 'Unique identifier for the resource.', 'woocommerce' ),
                    'type'        => 'integer',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'parent_id'            => array(
                    'description' => __( 'Parent order ID.', 'woocommerce' ),
                    'type'        => 'integer',
                    'context'     => array( 'view', 'edit' ),
                ),
                'number'               => array(
                    'description' => __( 'Order number.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'order_key'            => array(
                    'description' => __( 'Order key.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'created_via'          => array(
                    'description' => __( 'Shows where the order was created.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'version'              => array(
                    'description' => __( 'Version of WooCommerce which last updated the order.', 'woocommerce' ),
                    'type'        => 'integer',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'status'               => array(
                    'description' => __( 'Order status.', 'woocommerce' ),
                    'type'        => 'string',
                    'default'     => 'pending',
                    'enum'        => $this->get_order_statuses(),
                    'context'     => array( 'view', 'edit' ),
                ),
                'currency'             => array(
                    'description' => __( 'Currency the order was created with, in ISO format.', 'woocommerce' ),
                    'type'        => 'string',
                    'default'     => get_woocommerce_currency(),
                    'enum'        => array_keys( get_woocommerce_currencies() ),
                    'context'     => array( 'view', 'edit' ),
                ),
                'date_created'         => array(
                    'description' => __( "The date the order was created, in the site's timezone.", 'woocommerce' ),
                    'type'        => 'date-time',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'date_created_gmt'     => array(
                    'description' => __( 'The date the order was created, as GMT.', 'woocommerce' ),
                    'type'        => 'date-time',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'date_modified'        => array(
                    'description' => __( "The date the order was last modified, in the site's timezone.", 'woocommerce' ),
                    'type'        => 'date-time',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'date_modified_gmt'    => array(
                    'description' => __( 'The date the order was last modified, as GMT.', 'woocommerce' ),
                    'type'        => 'date-time',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'discount_total'       => array(
                    'description' => __( 'Total discount amount for the order.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'discount_tax'         => array(
                    'description' => __( 'Total discount tax amount for the order.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'shipping_total'       => array(
                    'description' => __( 'Total shipping amount for the order.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'shipping_tax'         => array(
                    'description' => __( 'Total shipping tax amount for the order.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'cart_tax'             => array(
                    'description' => __( 'Sum of line item taxes only.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'total'                => array(
                    'description' => __( 'Grand total.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'total_tax'            => array(
                    'description' => __( 'Sum of all taxes.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'prices_include_tax'   => array(
                    'description' => __( 'True the prices included tax during checkout.', 'woocommerce' ),
                    'type'        => 'boolean',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'customer_id'          => array(
                    'description' => __( 'User ID who owns the order. 0 for guests.', 'woocommerce' ),
                    'type'        => 'integer',
                    'default'     => 0,
                    'context'     => array( 'view', 'edit' ),
                ),
                'customer_ip_address'  => array(
                    'description' => __( "Customer's IP address.", 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'customer_user_agent'  => array(
                    'description' => __( 'User agent of the customer.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'customer_note'        => array(
                    'description' => __( 'Note left by customer during checkout.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                ),
                'billing'              => array(
                    'description' => __( 'Billing address.', 'woocommerce' ),
                    'type'        => 'object',
                    'context'     => array( 'view', 'edit' ),
                    'properties'  => array(
                        'first_name' => array(
                            'description' => __( 'First name.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'last_name'  => array(
                            'description' => __( 'Last name.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'company'    => array(
                            'description' => __( 'Company name.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'address_1'  => array(
                            'description' => __( 'Address line 1', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'address_2'  => array(
                            'description' => __( 'Address line 2', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'city'       => array(
                            'description' => __( 'City name.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'state'      => array(
                            'description' => __( 'ISO code or name of the state, province or district.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'postcode'   => array(
                            'description' => __( 'Postal code.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'country'    => array(
                            'description' => __( 'Country code in ISO 3166-1 alpha-2 format.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'email'      => array(
                            'description' => __( 'Email address.', 'woocommerce' ),
                            'type'        => 'string',
                            'format'      => 'email',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'phone'      => array(
                            'description' => __( 'Phone number.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                    ),
                ),
                'shipping'             => array(
                    'description' => __( 'Shipping address.', 'woocommerce' ),
                    'type'        => 'object',
                    'context'     => array( 'view', 'edit' ),
                    'properties'  => array(
                        'first_name' => array(
                            'description' => __( 'First name.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'last_name'  => array(
                            'description' => __( 'Last name.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'company'    => array(
                            'description' => __( 'Company name.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'address_1'  => array(
                            'description' => __( 'Address line 1', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'address_2'  => array(
                            'description' => __( 'Address line 2', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'city'       => array(
                            'description' => __( 'City name.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'state'      => array(
                            'description' => __( 'ISO code or name of the state, province or district.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'postcode'   => array(
                            'description' => __( 'Postal code.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                        'country'    => array(
                            'description' => __( 'Country code in ISO 3166-1 alpha-2 format.', 'woocommerce' ),
                            'type'        => 'string',
                            'context'     => array( 'view', 'edit' ),
                        ),
                    ),
                ),
                'payment_method'       => array(
                    'description' => __( 'Payment method ID.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                ),
                'payment_method_title' => array(
                    'description' => __( 'Payment method title.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'arg_options' => array(
                        'sanitize_callback' => 'sanitize_text_field',
                    ),
                ),
                'transaction_id'       => array(
                    'description' => __( 'Unique transaction ID.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                ),
                'date_paid'            => array(
                    'description' => __( "The date the order was paid, in the site's timezone.", 'woocommerce' ),
                    'type'        => 'date-time',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'date_paid_gmt'        => array(
                    'description' => __( 'The date the order was paid, as GMT.', 'woocommerce' ),
                    'type'        => 'date-time',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'date_completed'       => array(
                    'description' => __( "The date the order was completed, in the site's timezone.", 'woocommerce' ),
                    'type'        => 'date-time',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'date_completed_gmt'   => array(
                    'description' => __( 'The date the order was completed, as GMT.', 'woocommerce' ),
                    'type'        => 'date-time',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'cart_hash'            => array(
                    'description' => __( 'MD5 hash of cart items to ensure orders are not modified.', 'woocommerce' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                ),
                'meta_data'            => array(
                    'description' => __( 'Meta data.', 'woocommerce' ),
                    'type'        => 'array',
                    'context'     => array( 'view', 'edit' ),
                    'items'       => array(
                        'type'       => 'object',
                        'properties' => array(
                            'id'    => array(
                                'description' => __( 'Meta ID.', 'woocommerce' ),
                                'type'        => 'integer',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'key'   => array(
                                'description' => __( 'Meta key.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'value' => array(
                                'description' => __( 'Meta value.', 'woocommerce' ),
                                'type'        => 'mixed',
                                'context'     => array( 'view', 'edit' ),
                            ),
                        ),
                    ),
                ),
                'line_items'           => array(
                    'description' => __( 'Line items data.', 'woocommerce' ),
                    'type'        => 'array',
                    'context'     => array( 'view', 'edit' ),
                    'items'       => array(
                        'type'       => 'object',
                        'properties' => array(
                            'id'           => array(
                                'description' => __( 'Item ID.', 'woocommerce' ),
                                'type'        => 'integer',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'name'         => array(
                                'description' => __( 'Product name.', 'woocommerce' ),
                                'type'        => 'mixed',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'parent_name'  => array(
                                'description' => __( 'Parent product name if the product is a variation.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'product_id'   => array(
                                'description' => __( 'Product ID.', 'woocommerce' ),
                                'type'        => 'mixed',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'variation_id' => array(
                                'description' => __( 'Variation ID, if applicable.', 'woocommerce' ),
                                'type'        => 'integer',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'quantity'     => array(
                                'description' => __( 'Quantity ordered.', 'woocommerce' ),
                                'type'        => 'integer',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'tax_class'    => array(
                                'description' => __( 'Tax class of product.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'subtotal'     => array(
                                'description' => __( 'Line subtotal (before discounts).', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'subtotal_tax' => array(
                                'description' => __( 'Line subtotal tax (before discounts).', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'total'        => array(
                                'description' => __( 'Line total (after discounts).', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'total_tax'    => array(
                                'description' => __( 'Line total tax (after discounts).', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'taxes'        => array(
                                'description' => __( 'Line taxes.', 'woocommerce' ),
                                'type'        => 'array',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                                'items'       => array(
                                    'type'       => 'object',
                                    'properties' => array(
                                        'id'       => array(
                                            'description' => __( 'Tax rate ID.', 'woocommerce' ),
                                            'type'        => 'integer',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                        'total'    => array(
                                            'description' => __( 'Tax total.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                        'subtotal' => array(
                                            'description' => __( 'Tax subtotal.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                    ),
                                ),
                            ),
                            'meta_data'    => array(
                                'description' => __( 'Meta data.', 'woocommerce' ),
                                'type'        => 'array',
                                'context'     => array( 'view', 'edit' ),
                                'items'       => array(
                                    'type'       => 'object',
                                    'properties' => array(
                                        'id'            => array(
                                            'description' => __( 'Meta ID.', 'woocommerce' ),
                                            'type'        => 'integer',
                                            'context'     => array( 'view', 'edit' ),
                                            'readonly'    => true,
                                        ),
                                        'key'           => array(
                                            'description' => __( 'Meta key.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                        'value'         => array(
                                            'description' => __( 'Meta value.', 'woocommerce' ),
                                            'type'        => 'mixed',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                        'display_key'   => array(
                                            'description' => __( 'Meta key for UI display.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                        'display_value' => array(
                                            'description' => __( 'Meta value for UI display.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                    ),
                                ),
                            ),
                            'sku'          => array(
                                'description' => __( 'Product SKU.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'price'        => array(
                                'description' => __( 'Product price.', 'woocommerce' ),
                                'type'        => 'number',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                        ),
                    ),
                ),
                'tax_lines'            => array(
                    'description' => __( 'Tax lines data.', 'woocommerce' ),
                    'type'        => 'array',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                    'items'       => array(
                        'type'       => 'object',
                        'properties' => array(
                            'id'                 => array(
                                'description' => __( 'Item ID.', 'woocommerce' ),
                                'type'        => 'integer',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'rate_code'          => array(
                                'description' => __( 'Tax rate code.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'rate_id'            => array(
                                'description' => __( 'Tax rate ID.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'label'              => array(
                                'description' => __( 'Tax rate label.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'compound'           => array(
                                'description' => __( 'Show if is a compound tax rate.', 'woocommerce' ),
                                'type'        => 'boolean',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'tax_total'          => array(
                                'description' => __( 'Tax total (not including shipping taxes).', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'shipping_tax_total' => array(
                                'description' => __( 'Shipping tax total.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'meta_data'          => array(
                                'description' => __( 'Meta data.', 'woocommerce' ),
                                'type'        => 'array',
                                'context'     => array( 'view', 'edit' ),
                                'items'       => array(
                                    'type'       => 'object',
                                    'properties' => array(
                                        'id'    => array(
                                            'description' => __( 'Meta ID.', 'woocommerce' ),
                                            'type'        => 'integer',
                                            'context'     => array( 'view', 'edit' ),
                                            'readonly'    => true,
                                        ),
                                        'key'   => array(
                                            'description' => __( 'Meta key.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                        'value' => array(
                                            'description' => __( 'Meta value.', 'woocommerce' ),
                                            'type'        => 'mixed',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                    ),
                                ),
                            ),
                        ),
                    ),
                ),
                'shipping_lines'       => array(
                    'description' => __( 'Shipping lines data.', 'woocommerce' ),
                    'type'        => 'array',
                    'context'     => array( 'view', 'edit' ),
                    'items'       => array(
                        'type'       => 'object',
                        'properties' => array(
                            'id'           => array(
                                'description' => __( 'Item ID.', 'woocommerce' ),
                                'type'        => 'integer',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'method_title' => array(
                                'description' => __( 'Shipping method name.', 'woocommerce' ),
                                'type'        => 'mixed',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'method_id'    => array(
                                'description' => __( 'Shipping method ID.', 'woocommerce' ),
                                'type'        => 'mixed',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'instance_id'  => array(
                                'description' => __( 'Shipping instance ID.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'total'        => array(
                                'description' => __( 'Line total (after discounts).', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'total_tax'    => array(
                                'description' => __( 'Line total tax (after discounts).', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'taxes'        => array(
                                'description' => __( 'Line taxes.', 'woocommerce' ),
                                'type'        => 'array',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                                'items'       => array(
                                    'type'       => 'object',
                                    'properties' => array(
                                        'id'    => array(
                                            'description' => __( 'Tax rate ID.', 'woocommerce' ),
                                            'type'        => 'integer',
                                            'context'     => array( 'view', 'edit' ),
                                            'readonly'    => true,
                                        ),
                                        'total' => array(
                                            'description' => __( 'Tax total.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                            'readonly'    => true,
                                        ),
                                    ),
                                ),
                            ),
                            'meta_data'    => array(
                                'description' => __( 'Meta data.', 'woocommerce' ),
                                'type'        => 'array',
                                'context'     => array( 'view', 'edit' ),
                                'items'       => array(
                                    'type'       => 'object',
                                    'properties' => array(
                                        'id'    => array(
                                            'description' => __( 'Meta ID.', 'woocommerce' ),
                                            'type'        => 'integer',
                                            'context'     => array( 'view', 'edit' ),
                                            'readonly'    => true,
                                        ),
                                        'key'   => array(
                                            'description' => __( 'Meta key.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                        'value' => array(
                                            'description' => __( 'Meta value.', 'woocommerce' ),
                                            'type'        => 'mixed',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                    ),
                                ),
                            ),
                        ),
                    ),
                ),
                'fee_lines'            => array(
                    'description' => __( 'Fee lines data.', 'woocommerce' ),
                    'type'        => 'array',
                    'context'     => array( 'view', 'edit' ),
                    'items'       => array(
                        'type'       => 'object',
                        'properties' => array(
                            'id'         => array(
                                'description' => __( 'Item ID.', 'woocommerce' ),
                                'type'        => 'integer',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'name'       => array(
                                'description' => __( 'Fee name.', 'woocommerce' ),
                                'type'        => 'mixed',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'tax_class'  => array(
                                'description' => __( 'Tax class of fee.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'tax_status' => array(
                                'description' => __( 'Tax status of fee.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'enum'        => array( 'taxable', 'none' ),
                            ),
                            'total'      => array(
                                'description' => __( 'Line total (after discounts).', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'total_tax'  => array(
                                'description' => __( 'Line total tax (after discounts).', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'taxes'      => array(
                                'description' => __( 'Line taxes.', 'woocommerce' ),
                                'type'        => 'array',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                                'items'       => array(
                                    'type'       => 'object',
                                    'properties' => array(
                                        'id'       => array(
                                            'description' => __( 'Tax rate ID.', 'woocommerce' ),
                                            'type'        => 'integer',
                                            'context'     => array( 'view', 'edit' ),
                                            'readonly'    => true,
                                        ),
                                        'total'    => array(
                                            'description' => __( 'Tax total.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                            'readonly'    => true,
                                        ),
                                        'subtotal' => array(
                                            'description' => __( 'Tax subtotal.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                            'readonly'    => true,
                                        ),
                                    ),
                                ),
                            ),
                            'meta_data'  => array(
                                'description' => __( 'Meta data.', 'woocommerce' ),
                                'type'        => 'array',
                                'context'     => array( 'view', 'edit' ),
                                'items'       => array(
                                    'type'       => 'object',
                                    'properties' => array(
                                        'id'    => array(
                                            'description' => __( 'Meta ID.', 'woocommerce' ),
                                            'type'        => 'integer',
                                            'context'     => array( 'view', 'edit' ),
                                            'readonly'    => true,
                                        ),
                                        'key'   => array(
                                            'description' => __( 'Meta key.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                        'value' => array(
                                            'description' => __( 'Meta value.', 'woocommerce' ),
                                            'type'        => 'mixed',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                    ),
                                ),
                            ),
                        ),
                    ),
                ),
                'coupon_lines'         => array(
                    'description' => __( 'Coupons line data.', 'woocommerce' ),
                    'type'        => 'array',
                    'context'     => array( 'view', 'edit' ),
                    'items'       => array(
                        'type'       => 'object',
                        'properties' => array(
                            'id'           => array(
                                'description' => __( 'Item ID.', 'woocommerce' ),
                                'type'        => 'integer',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'code'         => array(
                                'description' => __( 'Coupon code.', 'woocommerce' ),
                                'type'        => 'mixed',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'discount'     => array(
                                'description' => __( 'Discount total.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                            ),
                            'discount_tax' => array(
                                'description' => __( 'Discount total tax.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'meta_data'    => array(
                                'description' => __( 'Meta data.', 'woocommerce' ),
                                'type'        => 'array',
                                'context'     => array( 'view', 'edit' ),
                                'items'       => array(
                                    'type'       => 'object',
                                    'properties' => array(
                                        'id'    => array(
                                            'description' => __( 'Meta ID.', 'woocommerce' ),
                                            'type'        => 'integer',
                                            'context'     => array( 'view', 'edit' ),
                                            'readonly'    => true,
                                        ),
                                        'key'   => array(
                                            'description' => __( 'Meta key.', 'woocommerce' ),
                                            'type'        => 'string',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                        'value' => array(
                                            'description' => __( 'Meta value.', 'woocommerce' ),
                                            'type'        => 'mixed',
                                            'context'     => array( 'view', 'edit' ),
                                        ),
                                    ),
                                ),
                            ),
                        ),
                    ),
                ),
                'refunds'              => array(
                    'description' => __( 'List of refunds.', 'woocommerce' ),
                    'type'        => 'array',
                    'context'     => array( 'view', 'edit' ),
                    'readonly'    => true,
                    'items'       => array(
                        'type'       => 'object',
                        'properties' => array(
                            'id'     => array(
                                'description' => __( 'Refund ID.', 'woocommerce' ),
                                'type'        => 'integer',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'reason' => array(
                                'description' => __( 'Refund reason.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                            'total'  => array(
                                'description' => __( 'Refund total.', 'woocommerce' ),
                                'type'        => 'string',
                                'context'     => array( 'view', 'edit' ),
                                'readonly'    => true,
                            ),
                        ),
                    ),
                ),
                'set_paid'             => array(
                    'description' => __( 'Define if the order is paid. It will set the status to processing and reduce stock items.', 'woocommerce' ),
                    'type'        => 'boolean',
                    'default'     => false,
                    'context'     => array( 'edit' ),
                ),
            ),
        );

        return $this->add_additional_fields_schema( $schema );
    }

    /**
     * Get the query params for collections.
     *
     * @return array
     */
    public function get_collection_params() {
        $params = parent::get_collection_params();

        $params['status']   = array(
            'default'           => 'any',
            'description'       => __( 'Limit result set to orders assigned a specific status.', 'woocommerce' ),
            'type'              => 'string',
            'enum'              => array_merge( array( 'any', 'trash' ), $this->get_order_statuses() ),
            'sanitize_callback' => 'sanitize_key',
            'validate_callback' => 'rest_validate_request_arg',
        );
        $params['customer'] = array(
            'description'       => __( 'Limit result set to orders assigned a specific customer.', 'woocommerce' ),
            'type'              => 'integer',
            'sanitize_callback' => 'absint',
            'validate_callback' => 'rest_validate_request_arg',
        );
        $params['product']  = array(
            'description'       => __( 'Limit result set to orders assigned a specific product.', 'woocommerce' ),
            'type'              => 'integer',
            'sanitize_callback' => 'absint',
            'validate_callback' => 'rest_validate_request_arg',
        );
        $params['dp']       = array(
            'default'           => wc_get_price_decimals(),
            'description'       => __( 'Number of decimal points to use in each resource.', 'woocommerce' ),
            'type'              => 'integer',
            'sanitize_callback' => 'absint',
            'validate_callback' => 'rest_validate_request_arg',
        );

        return $params;
    }
}