curl -X POST "https://api.bouncedetector.com/api/v1/batches/507f1f77bcf86cd799439011/cancel" \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "message": "Batch cancelled",
  "batch": {
    "_id": "507f1f77bcf86cd799439011",
    "status": "cancelled",
    "totalCount": 100,
    "processedCount": 45,
    "createdAt": "2025-03-09T14:25:00.000Z"
  }
}