curl --request PUT \
  --url https://{tenant}.stamp.eu/rest/employees/{employee}/overtime_accounts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "year_month": "2026-03",
  "balance_ms": 123
}
'

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "employee_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "year_month": "<string>",
    "balance": 123,
    "earned": 123,
    "compensated": 123,
    "adjusted": true,
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  }
}