protected function read_order_data( &$order, $post_object ) {
		$id = $order->get_id();

		$order->set_props(
			array(
				'currency'           => get_post_meta( $id, '_order_currency', true ),
				'discount_total'     => get_post_meta( $id, '_cart_discount', true ),
				'discount_tax'       => get_post_meta( $id, '_cart_discount_tax', true ),
				'shipping_total'     => get_post_meta( $id, '_order_shipping', true ),
				'shipping_tax'       => get_post_meta( $id, '_order_shipping_tax', true ),
				'cart_tax'           => get_post_meta( $id, '_order_tax', true ),
				'total'              => get_post_meta( $id, '_order_total', true ),
				'version'            => get_post_meta( $id, '_order_version', true ),
				'prices_include_tax' => metadata_exists( 'post', $id, '_prices_include_tax' ) ? 'yes' === get_post_meta( $id, '_prices_include_tax', true ) : 'yes' === get_option( 'woocommerce_prices_include_tax' ),
			)
		);

		// Gets extra data associated with the order if needed.
		foreach ( $order->get_extra_data_keys() as $key ) {
			$function = 'set_' . $key;
			if ( is_callable( array( $order, $function ) ) ) {
				$order->{$function}( get_post_meta( $order->get_id(), '_' . $key, true ) );
			}
		}
	}