Validate room charge

curl --request POST \
  --url https://api.letsway.com/v1/brands/{brandId}/room-charge/{integrationType}/validate \
  --header 'Content-Type: application/json' \
  --data '{}'

{
  "reservationId": "res-123",
  "arrivalDate": "2024-03-10",
  "departureDate": "2024-03-15",
  "status": "CONFIRMED",
  "confirmationId": "CONFIRM-456",
  "guests": [
    {
      "lastName": "Doe",
      "firstName": "John"
    }
  ],
  "comments": [
    {
      "id": "comment-001",
      "type": "General",
      "title": "Request",
      "comment": {
        "value": "Special request: late check-out"
      }
    }
  ],
  "fixedCharges": [
    {
      "description": "Late checkout fee",
      "amount": 50
    }
  ],
  "postings": [
    {
      "transactionNo": 12345
    }
  ],
  "arrivalTime": "14:00",
  "departureTime": "11:00"
}