protected function update_post_meta( &$refund ) {
		parent::update_post_meta( $refund );

		$updated_props     = array();
		$meta_key_to_props = array(
			'_refund_amount'    => 'amount',
			'_refunded_by'      => 'refunded_by',
			'_refunded_payment' => 'refunded_payment',
			'_refund_reason'    => 'reason',
		);

		$props_to_update = $this->get_props_to_update( $refund, $meta_key_to_props );
		foreach ( $props_to_update as $meta_key => $prop ) {
			$value = $refund->{"get_$prop"}( 'edit' );
			update_post_meta( $refund->get_id(), $meta_key, $value );
			$updated_props[] = $prop;
		}

		do_action( 'woocommerce_order_refund_object_updated_props', $refund, $updated_props );
	}