Where product data comes from. "listing" (default): parsed directly from the search/category result cards — title, brand, price, crossed-out price, availability, in-stock flag, condition, seller, rating, review count, the card's main specs, image and the lowest marketplace offer. Only the listing pages are fetched: a 40-item run is a handful of requests, finishes in seconds and costs roughly $0.01 of proxy. ean, sku, mpn, description, the full spec table and review texts stay null (direct productUrls are still parsed in full). "full": also fetches every product page for complete data — EAN/GTIN, description, full spec table, marketplace offer list, review sample — about 50 requests, ~$0.15, 60-110 seconds. Each saved full item is billed as the premium full-result pay-per-event charge (see README, Pricing).