With the new Order backend event APIs you can write code that is triggered when an order is refunded and/or canceled.
onOrderRefunded() API - https://www.wix.com/velo/reference/wix-stores-backend/events/onorderrefunded
onOrderCanceled() API - https://www.wix.com/velo/reference/wix-stores-backend/events/onordercanceled
Learn more about Velo backend events: https://support.wix.com/en/article/velo-backend-events
