{
  "kind": "grant",
  "upload_id": "upload-1",
  "recording_id": "recording-1",
  "upload_url": "https://oss.example.invalid/upload/upload-1",
  "required_headers": {"x-checksum-sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"},
  "expires_at": "2026-09-18T00:05:00Z",
  "max_bytes": 16777216,
  "object_binding": "recording-1:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
}