The AI Cover API only returned a webhookId. How do I confirm completion and get the audio?

The webhookId matches a request to its callback. It is neither an audio URL nor a cover history record ID. Receive the callback at your callbackUrl and check the matching webhookId, type COVER_SONG and status SUCCESS or FAILURE. To retrieve a finished cover, find its record ID in the cover history list and use that record ID to query the audio URL. If no callback arrived, check your receiver and existing history before submitting anything again.