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{
"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
}