Use compensation handlers to add business logic for compensating the actions that have completed before the cancellation event happens.
使用补偿处理程序来添加业务逻辑，来补偿在取消事件发生前就完成的动作。
2
If the customer cancels the request before auditor1 approves the request, the system only needs to send a notice to auditor1 about the cancellation as the compensation.