{
  "contact_email": "adops@ssp.example",
  "version": "1.0",
  "sellers": [
    {"seller_id": "pub-1001", "name": "Example Channel", "domain": "channel.example", "seller_type": "PUBLISHER"},
    {"seller_id": "pub-1002", "seller_type": "PUBLISHER", "is_confidential": 1}
  ]
}