mmerce_force_ssl_checkout',
		'woocommerce_hide_out_of_stock_items',
		'woocommerce_file_download_method',
		'woocommerce_enable_signup_and_login_from_checkout',
		'woocommerce_enable_shipping_calc',
		'woocommerce_enable_review_rating',
		'woocommerce_enable_guest_checkout',
		'woocommerce_enable_coupons',
		'woocommerce_enable_checkout_login_reminder',
		'woocommerce_enable_ajax_add_to_cart',
		'woocommerce_dimension_unit',
		'woocommerce_default_country',
		'woocommerce_default_customer_address',
		'woocommerce_currency_pos',
		'woocommerce_api_enabled',
		'woocommerce_allow_tracking',
		'woocommerce_task_list_hidden',
		'woocommerce_onboarding_profile',
		'woocommerce_cod_settings',
	);

	/**
	 * Whitelist for constants we are interested to sync.
	 *
	 * @access private
	 * @static
	 *
	 * @var array
	 */
	private static $wc_constants_whitelist = array(
		// WooCommerce constants.
		'WC_PLUGIN_FILE',
		'WC_ABSPATH',
		'WC_PLUGIN_BASENAME',
		'WC_VERSION',
		'WOOCOMMERCE_VERSION',
		'WC_ROUNDING_PRECISION',
		'WC_DISCOUNT_ROUNDING_MODE',
		'WC_TAX_ROUNDING_MODE',
		'WC_DELIMITER',
		'WC_LOG_DIR',
		'WC_SESSION_CACHE_GROUP',
		'WC_TEMPLATE_DEBUG_MODE',
	);

	/**
	 * Whitelist for post meta we are interested to sync.
	 *
	 * @access private
	 * @static
	 *
	 * @var array
	 */
	public static $wc_post_meta_whitelist = array(
		// WooCommerce products.
		// See https://github.com/woocommerce/woocommerce/blob/8ed6e7436ff87c2153ed30edd83c1ab8abbdd3e9/includes/data-stores/class-wc-product-data-store-cpt.php#L21 .
		'_visibility',
		'_sku',
		'_price',
		'_regular_price',
		'_sale_price',
		'_sale_price_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',
		'_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',

		// 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.
	 *
	 * @access public
	 *
	 * @return array|object|null
	 */
	public function get_order_item_by_ids( $ids ) {
		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 )";

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