curl --request POST \
  --url https://api.cadanapay.com/v1/statutory/filings/{filing_id}/cancel \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "reason": "<string>"
}
'

{
  "error": {
    "code": "invalid_request",
    "message": "countryCode is required",
    "details": [
      {
        "field": "<string>",
        "message": "<string>"
      }
    ]
  }
}