When the file is ready, a relative path such as /v1/recordings/{id}/audio. Call it on https://api.kallglot.com with your API key (no separate download token in the response contract).
When download_url is present it points at the /v1/recordings/{id}/audio path on https://api.kallglot.com. Use your normal API key—there is no separate download token in the REST contract.
Recordings are automatically deleted based on your retention policy. After the expires_at date, the recording will no longer be available.