] ) ) {
			$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 );

		/**
		 * Allow extensions be notified before the item before is saved.
		 *
		 * @param WC_Order_Item $item The item object.
		 * @param array         $posted The item data.
		 *
		 * @since 4.5.0.
		 */
		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( 'auto-draft' );

		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'        => 'string',
					'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'        => array( 'string', 'null' ),
							'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,
							),
							'image'        => array(
								'description' => __( 'Properties of the main product image.', 'woocommerce' ),
								'type'        => 'object',
								'context'     => array( 'view', 'edit' ),
								'readonly'    => true,
								'properties'  => array(
									'id'  => array(
										'description' => __( 'Image ID.', 'woocommerce' ),
										'type'        => 'integer',
										'context'     => array( 'view', 'edit' ),
									),
									'src' => array(
										'description' => __( 'Image URL.', 'woocommerce' ),
										'type'        => 'string',
										'format'      => 'uri',
										'context'     => array( 'view', 'edit' ),
									),
								),
							),
						),
					),
				),
				'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,
							),
						),
					),
				),
				'payment_url'          => array(
					'description' => __( 'Order payment URL.', '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' ),
				),
				'is_editable'          => array(
					'description' => __( 'Whether an order can be edited.', 'woocommerce' ),
					'type'        => 'boolean',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'needs_payment'        => array(
					'description' => __( 'Whether an order needs payment, based on status and order total.', 'woocommerce' ),
					'type'        => 'boolean',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'needs_processing'     => array(
					'description' => __( 'Whether an order needs processing before it can be completed.', 'woocommerce' ),
					'type'        => 'boolean',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
			),
		);

		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',
		);
		$params['order_item_display_meta'] = array(
			'default'           => false,
			'description'       => __( 'Only show meta which is meant to be displayed for an order.', 'woocommerce' ),
			'type'              => 'boolean',
			'sanitize_callback' => 'rest_sanitize_boolean',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['include_meta']            = array(
			'default'           => array(),
			'description'       => __( 'Limit meta_data to specific keys.', 'woocommerce' ),
			'type'              => 'array',
			'items'             => array(
				'type' => 'string',
			),
			'sanitize_callback' => 'wp_parse_list',
		);
		$params['exclude_meta']            = array(
			'default'           => array(),
			'description'       => __( 'Ensure meta_data excludes specific keys.', 'woocommerce' ),
			'type'              => 'array',
			'items'             => array(
				'type' => 'string',
			),
			'sanitize_callback' => 'wp_parse_list',
		);

		return $params;
	}

	/**
	 * Get objects.
	 *
	 * @param  array $query_args Query args.
	 * @return array
	 */
	protected function get_objects( $query_args ) {
		// Do not use WC_Order_Query for the CPT datastore.
		if ( ! OrderUtil::custom_orders_table_usage_is_enabled() ) {
			return parent::get_objects( $query_args );
		}

		$query   = new \WC_Order_Query(
			array_merge(
				$query_args,
				array(
					'paginate' => true,
				)
			)
		);
		$results = $query->get_orders();

		return array(
			'objects' => $results->orders,
			'total'   => $results->total,
			'pages'   => $results->max_num_pages,
		);
	}
}