How does Adyen respond to payment modification requests?

Response messages

Adyen replies to payment modification requests with an appropriate response message, for example, capture-received, cancel-received, or refund-received, and a unique PSP reference of this request. These messages mean the request is being processed.

You'll receive the final status of the modification via webhook events. These webhook events are sent as HTTP callbacks to the endpoints you set up on your server.

Tip: Read more on webhooks.