curl --request POST \
  --url https://api.altostrat.io/radius/migration/dry-run \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "filename": "<string>",
  "mapping": {},
  "settings": {
    "delimiter": "<string>",
    "skip_lines": 123,
    "import_type": "users"
  }
}
'