curl --request POST \
  --url https://api.example.com/v2/knowledge-bases/{kb_id}/documents/website \
  --header 'Content-Type: application/json' \
  --data '
{
  "base_url": "<string>",
  "selected_sitemap_urls": [
    "<string>"
  ]
}
'

{
  "processing_status": {
    "status": "processing",
    "message": "<string>",
    "document_ids": []
  }
}