{
  "status": "success",
  "message": "Invoice created successfully.",
  "data": {
    "id": 13,
    "amount": 7500,
    "client_id": 3,
    "service_id": 7,
    "created_at": "2025-09-20",
    "due_date": "2025-10-25",
    "status": "pending"
  }
}