curl --request POST \
  --url https://api.{tenant}.getomneo.com/api/v3/appointment-definitions/{appointmentDefinition}/normal-hours \
  --header 'Content-Type: application/json' \
  --data '
{
  "available_from": "<string>",
  "available_until": "<string>"
}
'

{
  "data": {
    "id": 123,
    "appointment_definition_id": 123,
    "day_of_week": "<string>",
    "available_from": "<string>",
    "available_until": "<string>",
    "is_closed": "<string>",
    "created_at": "<string>",
    "updated_at": "<string>"
  }
}