curl --request GET \
  --url https://api.merchantops.ai/api/lakehouse/documents/{document_id}/preview

{
  "column_mapping": {},
  "document_id": "<string>",
  "preview_products": [
    {
      "brand": "<string>",
      "confidence": 123,
      "description": "<string>",
      "mapped_fields": {},
      "product_name": "<string>",
      "row_number": 123,
      "vendor_style_id": "<string>"
    }
  ],
  "total_rows": 123
}