curl --request POST \
  --url https://api.propops.app/api/contractors/certification \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form action=upload \
  --form contractor_uuid=3c90c3cc-0d44-4b50-8888-8dd25736052a \
  --form csrf_token=abc123def456 \
  --form 'cert_type=Gas Safe Certificate' \
  --form expiry_date=2025-12-31 \
  --form file='@example-file'

{
  "success": true,
  "message": "Operation completed successfully"
}