{
  "list_id": "a0ee-9c0b-1122",
  "template_id": "8c7d-bcde-1122",
  "common_params": {
    "site_url": "https://syntr.io"
  }
}

{
  "success": true,
  "data": {
    "total": 100,
    "sent": 98,
    "failed": 2,
    "details": []
  },
  "message": "Batch processing complete."
}