The "Give Cashback to User" API is a request type API.
Since the "Give Cashback to User" API is a request type API, when the "Give Cashback to User" API is executed, the request to grant the balance is accepted, but the granting of the balance is not completed.
Therefore, after executing the "Give Cashback to User" API, the completion of the balance grant can be detected by the webhook notification or the "Check Cashback Details" API.
In the case of webhook notifications, we recommend that you use the "Check Cashback Details" API to confirm that the balance has been granted, as it is not 100% guaranteed.