curl --request GET \
  --url https://api.engrate.io/schedule-management/v1/mabis/clearing-periods/{uid}/validate \
  --header 'Authorization: <api-key>'

{
  "valid": true,
  "clearing_period_uid": "<string>",
  "bilanzierungsmonat": "<string>",
  "status": "<string>",
  "settlement_count": 123,
  "expected_days": 123,
  "message_count": 123,
  "issues": [
    "<string>"
  ]
}