curl --request POST \
  --url https://api.anysite.io/api/kleinanzeigen/listings \
  --header 'Content-Type: application/json' \
  --header 'access-token: <api-key>' \
  --data '
{
  "ad": "<string>",
  "timeout": 300
}
'

[
  {
    "id": "<string>",
    "url": "<string>",
    "@type": "@kleinanzeigen_listing",
    "title": "<string>",
    "price": 123,
    "currency": "EUR",
    "old_price": 123,
    "is_negotiable": false,
    "is_free": false,
    "is_top_ad": false,
    "is_sold": false,
    "shipping": "<string>",
    "description": "<string>",
    "postal_code": "<string>",
    "state": "<string>",
    "city": "<string>",
    "posted_at": "<string>",
    "attributes": {},
    "breadcrumbs": [],
    "category": "<string>",
    "category_id": "<string>",
    "image": "<string>",
    "images": [],
    "seller": {
      "@type": "@kleinanzeigen_listing_seller",
      "id": "<string>",
      "name": "<string>",
      "type": "<string>",
      "active_since": "<string>",
      "active_ad_count": 123,
      "average_rating": 123,
      "rating_review_count": 123,
      "profile_url": "<string>"
    }
  }
]