curl --request PUT \
  --url https://{tenant}.stamp.eu/rest/employees/{employee}/working_time_comment \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "date": "2023-12-25",
  "comment": "<string>"
}
'

{
  "message": "<string>"
}