ce_dates_from',
		'_sale_price_dates_to',
		'total_sales',
		'_tax_status',
		'_tax_class',
		'_manage_stock',
		'_backorders',
		'_sold_individually',
		'_weight',
		'_length',
		'_width',
		'_height',
		'_upsell_ids',
		'_crosssell_ids',
		'_purchase_note',
		'_default_attributes',
		'_product_attributes',
		'_virtual',
		'_downloadable',
		'_download_limit',
		'_download_expiry',
		'_featured',
		'_downloadable_files',
		'_wc_rating_count',
		'_wc_average_rating',
		'_wc_review_count',
		'_variation_description',
		'_thumbnail_id',
		'_file_paths',
		'_product_image_gallery',
		'_product_version',
		'_wp_old_slug',

		// Woocommerce orders.
		// See https://github.com/woocommerce/woocommerce/blob/8ed6e7436ff87c2153ed30edd83c1ab8abbdd3e9/includes/data-stores/class-wc-order-data-store-cpt.php#L27 .
		'_order_key',
		'_order_currency',
		// '_billing_first_name', do not sync these as they contain personal data
		// '_billing_last_name',
		// '_billing_company',
		// '_billing_address_1',
		// '_billing_address_2',
		'_billing_city',
		'_billing_state',
		'_billing_postcode',
		'_billing_country',
		// '_billing_email', do not sync these as they contain personal data.
		// '_billing_phone',
		// '_shipping_first_name',
		// '_shipping_last_name',
		// '_shipping_company',
		// '_shipping_address_1',
		// '_shipping_address_2',
		'_shipping_city',
		'_shipping_state',
		'_shipping_postcode',
		'_shipping_country',
		'_completed_date',
		'_paid_date',
		'_cart_discount',
		'_cart_discount_tax',
		'_order_shipping',
		'_order_shipping_tax',
		'_order_tax',
		'_order_total',
		'_payment_method',
		'_payment_method_title',
		// '_transaction_id', do not sync these as they contain personal data.
		// '_customer_ip_address',
		// '_customer_user_agent',
		'_created_via',
		'_order_version',
		'_prices_include_tax',
		'_date_completed',
		'_date_paid',
		'_payment_tokens',
		// '_billing_address_index', do not sync these as they contain personal data.
		// '_shipping_address_index',
		'_recorded_sales',
		'_recorded_coupon_usage_counts',
		// See https://github.com/woocommerce/woocommerce/blob/8ed6e7436ff87c2153ed30edd83c1ab8abbdd3e9/includes/data-stores/class-wc-order-data-store-cpt.php#L539 .
		'_download_permissions_granted',
		// See https://github.com/woocommerce/woocommerce/blob/8ed6e7436ff87c2153ed30edd83c1ab8abbdd3e9/includes/data-stores/class-wc-order-data-store-cpt.php#L594 .
		'_order_stock_reduced',
		'_cart_hash',

		// Woocommerce order refunds.
		// See https://github.com/woocommerce/woocommerce/blob/b8a2815ae546c836467008739e7ff5150cb08e93/includes/data-stores/class-wc-order-refund-data-store-cpt.php#L20 .
		'_order_currency',
		'_refund_amount',
		'_refunded_by',
		'_refund_reason',
		'_order_shipping',
		'_order_shipping_tax',
		'_order_tax',
		'_order_total',
		'_order_version',
		'_prices_include_tax',
		'_payment_tokens',
	);

	/**
	 * Whitelist for comment meta we are interested to sync.
	 *
	 * @access private
	 * @static
	 *
	 * @var array
	 */
	private static $wc_comment_meta_whitelist = array(
		'rating',
	);

	/**
	 * Return a list of objects by their type and IDs
	 *
	 * @param string $object_type Object type.
	 * @param array  $ids IDs of objects to return.
	 *
	 * @access public
	 *
	 * @return array|object|WP_Error|null
	 */
	public function get_objects_by_id( $object_type, $ids ) {
		switch ( $object_type ) {
			case 'order_item':
				return $this->get_order_item_by_ids( $ids );
		}

		return new WP_Error( 'unsupported_object_type', 'Unsupported object type' );
	}

	/**
	 * Returns a list of order_item objects by their IDs.
	 *
	 * @param array  $ids List of order_item IDs to fetch.
	 * @param string $order Either 'ASC' or 'DESC'.
	 *
	 * @access public
	 *
	 * @return array|object|null
	 */
	public function get_order_item_by_ids( $ids, $order = '' ) {
		global $wpdb;

		if ( ! is_array( $ids ) ) {
			return array();
		}

		// Make sure the IDs are numeric and are non-zero.
		$ids = array_filter( array_map( 'intval', $ids ) );

		if ( empty( $ids ) ) {
			return array();
		}

		// Prepare the placeholders for the prepared query below.
		$placeholders = implode( ',', array_fill( 0, count( $ids ), '%d' ) );

		$query = "SELECT * FROM {$this->order_item_table_name} WHERE order_item_id IN ( $placeholders )";
		if ( ! empty( $order ) && in_array( $order, array( 'ASC', 'DESC' ), true ) ) {
			$query .= " ORDER BY order_item_id $order";
		}

		// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
		return $wpdb->get_results( $wpdb->prepare( $query, $ids ), ARRAY_A );
	}

	/**
	 * Build the full sync action object for WooCommerce order items.
	 *
	 * @access public
	 *
	 * @param array $args An array with the order items and the previous end.
	 *
	 * @return array An array with the order items, order item meta and the previous end.
	 */
	public function build_full_sync_action_array( $args ) {
		list( $filtered_order_items, $previous_end ) = $args;
		return array(
			'order_items'     => $filtered_order_items['objects'],
			'order_item_meta' => $filtered_order_items['meta'],
			'previous_end'    => $previous_end,
		);
	}

	/**
	 * Given the Module Configuration and Status return the next chunk of items to send.
	 * This function also expands the posts and metadata and filters them based on the maximum size constraints.
	 *
	 * @param array $config This module Full Sync configuration.
	 * @param array $status This module Full Sync status.
	 * @param int   $chunk_size Chunk size.
	 *
	 * @return array
	 */
	public function get_next_chunk( $config, $status, $chunk_size ) {

		$order_item_ids = parent::get_next_chunk( $config, $status, $chunk_size );

		if ( empty( $order_item_ids ) ) {
			return array();
		}
		// Fetch the order items in DESC order for the next chunk logic to work.
		$order_items = $this->get_order_item_by_ids( $order_item_ids, 'DESC' );

		// If no orders were fetched, make sure to return the expected structure so that status is updated correctly.
		if ( empty( $order_items ) ) {
			return array(
				'object_ids' => $order_item_ids,
				'objects'    => array(),
			);
		}

		// Get the order IDs from the orders that were fetched.
		$fetched_order_item_ids = wp_list_pluck( $order_items, 'order_item_id' );
		$metadata               = $this->get_metadata( $fetched_order_item_ids, 'order_item', static::$order_item_meta_whitelist );

		// Filter the orders and metadata based on the maximum size constraints.
		list( $filtered_order_item_ids, $filtered_order_items, $filtered_order_items_metadata ) = $this->filter_objects_and_metadata_by_size(
			'order_item',
			$order_items,
			$metadata,
			self::MAX_META_LENGTH,
			self::MAX_SIZE_FULL_SYNC
		);

		return array(
			'object_ids' => $filtered_order_item_ids,
			'objects'    => $filtered_order_items,
			'meta'       => $filtered_order_items_metadata,
		);
	}
}