How can I determine the success or failure of cashback?

Use the "Give Cashback to User API" to give the user cashback.

If this API succeeds, HTTP status code 202 will be replied, but at this stage we have only accepted the request and the actual cashback will be asynchronous.

The result of asynchronous processing will be notified by WEBHOOK.

Alternatively, you can make a judgment by checking the response data-> status with the "Check Cashback Details API".