During the KYC process within the SEPA Secure flow, the customer's status can change multiple times. To keep you informed, we will send you a callback whenever there is a status update, along with information about any missing documents or errors that occurred during the KYC.
For the time being, SEPA Secure is provided only within the Checkout flow. There is no need to receive this type of callbacks.
The callback data here is presented only for the demo purpose.
You may then handle this information as necessary. You don't need to send us anything back other than a success status so that we know the callback has been received and handled on your side.