{
  "enabled": false,
  "vapid_public_key": "",
  "vapid_private_key": "",
  "vapid_subject": "mailto:ops@example.com",
  "workers": 2,
  "max_attempts": 3,
  "retry_backoff_base_secs": 30,
  "request_timeout_secs": 10,
  "delivery_concurrency": 4,
  "job_timeout_secs": 25,
  "ttl_secs": 86400
}