How to scrape product prices, stock and GTIN from any online store

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You have a list of product pages from competitors, suppliers or resellers, and you need the price, the stock status and the barcode for each one in a spreadsheet. Copying them by hand works for ten products and falls apart at five hundred. Writing a scraper per store is worse, because every store lays out its pages differently. There is a shortcut. Most online stores already publish their product data in a machine readable form (Schema.org product markup and Open Graph product tags), because search engines and social previews need it.

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