curl --request POST \
  --url https://api.anysite.io/api/kaufland/products/buy-box \
  --header 'Content-Type: application/json' \
  --header 'access-token: <api-key>' \
  --data '
{
  "product": "<string>",
  "timeout": 300,
  "storefront": "de"
}
'

[
  {
    "@type": "@kaufland_buy_box",
    "unit_id": "<string>",
    "price": 123,
    "uvp": 123,
    "reference_price": 123,
    "discount_off_uvp": 123,
    "currency": "<string>",
    "condition": "<string>",
    "amount_left": 123,
    "is_in_stock": true,
    "delivery_time": "<string>",
    "delivery_days_max": 123,
    "shipping_rate": 123,
    "fulfillment_type": "<string>",
    "seller": {
      "@type": "@kaufland_buy_box_seller",
      "id": 123,
      "name": "<string>",
      "shop_url": "<string>",
      "return_period": "<string>",
      "is_direct_seller": true
    }
  }
]