# FeedRobin > FeedRobin builds and hosts product feeds for online shops: one catalogue rendered to the format each > sales channel asks for — Google Shopping and Merchant Center, Facebook and Instagram, Microsoft/Bing, > ChatGPT and OpenAI Ads, European price comparators (Heureka, Compari, Árukereső, idealo), or custom > Google-format XML. It connects to Shopify or to any store that can publish a CSV or XML export, keeps > the feed current on its own, and checks a catalogue for the errors that get products rejected. The guides below are written for merchants and are the substantive part of this site: each one covers a specific channel's requirements or a specific rejection reason, and cites the official documentation it is drawn from. Everything else is product pages. ## Start here - [What is a product feed — and why every store advertising online needs one](https://www.feedrobin.com/guides/what-is-a-product-feed): The file behind every Google Shopping ad, Instagram product tag and price-comparator listing: what a product feed contains, who reads it, and what happens when it's wrong. ## When Google rejects your products - [Fix “Limited performance due to missing identifiers [gtin]” in Google Merchant Center](https://www.feedrobin.com/guides/missing-gtin-barcode-google-shopping): What Google's missing-GTIN warning means, where to find barcodes for your products, and what to do when a product genuinely has none. - [Price mismatch in Google Merchant Center: why it happens and how to fix it for good](https://www.feedrobin.com/guides/google-merchant-center-price-mismatch): Google suspends products when the feed price and the page price disagree. The usual causes — currency, sale prices, stale feeds — and the fixes. - [Product image errors in Google Shopping: too small, promotional overlay, missing image](https://www.feedrobin.com/guides/product-image-errors-google-shopping): The three image disapprovals that block most catalogs, what Google actually checks, and how to fix each one in your store. - [Google Merchant Center suspended for “Misrepresentation”: the recovery checklist](https://www.feedrobin.com/guides/google-merchant-center-misrepresentation-suspension): Misrepresentation is Google's vaguest suspension — and the most common. The signals Google actually checks, a step-by-step recovery checklist, and how to request the review. ## Getting a feed out of your store - [WooCommerce Google Shopping feed: the complete setup guide](https://www.feedrobin.com/guides/woocommerce-google-shopping-feed): WooCommerce doesn't generate a Google Shopping feed out of the box. How to create one, the Woo-specific traps — variable products, VAT prices, stale feeds — and how to keep it synced. - [Google Shopping feed for Magento and PrestaShop: the setup guide](https://www.feedrobin.com/guides/magento-prestashop-google-shopping-feed): Magento and PrestaShop don't export a Google Shopping feed. How to get a feed URL, map variants, barcodes and tax-inclusive prices, and keep it fresh. ## Beyond Google - [Get your products into ChatGPT: the OpenAI product feed, step by step](https://www.feedrobin.com/guides/get-your-products-into-chatgpt): ChatGPT now recommends real products with live prices. How merchant enrollment works, what OpenAI's feed spec requires (JSONL, nine mandatory fields), and why your catalogue disappears about two weeks after you stop uploading. - [Microsoft Merchant Center: get your Google feed onto Bing](https://www.feedrobin.com/guides/microsoft-merchant-center-bing-shopping-feed): Microsoft reads Google's feed format — but not all of it. The import tool, the attributes Bing ignores, and the 30-day expiry that empties your catalogue. - [Get your products on Compari, Árukereső and Heureka: the product feed guide](https://www.feedrobin.com/guides/compari-arukereso-heureka-product-feed): How the CEE price comparators work, the feed format they expect (it's not Google's), delivery-time fields, category mapping, and how to submit your catalog step by step. - [Facebook & Instagram catalog: why products get rejected (and what Meta only pretends to require)](https://www.feedrobin.com/guides/facebook-catalog-products-rejected): The wrong-format import trap, availability words Meta doesn't know, images ads can't use, price mismatches, ungrouped variants and unstable IDs — plus the fields Meta lists as required but never enforces. - [The idealo product feed: get your shop onto Germany's price comparison site](https://www.feedrobin.com/guides/idealo-product-feed): idealo takes its own CSV, not Google's XML. The required attributes, the shipping-cost column named after your carrier, why out-of-stock products must not be in the file, and what listing costs per click. - [llms.txt for online stores: what it is, and whether you need one](https://www.feedrobin.com/guides/llms-txt-for-online-stores): AI assistants now shop on people's behalf. What the llms.txt convention actually specifies, why Shopify stores already have one, what belongs in the file if yours doesn't, and what it will not do for you. - [Product feeds for price comparators: the XML formats explained](https://www.feedrobin.com/guides/price-comparator-feed-xml-formats): Heureka and Compari/Árukereső side by side, element by element — what they share underneath, why a shared owner doesn't mean a shared file, and the six mistakes that make a portal list zero products. ## Tools - [Free feed check](https://www.feedrobin.com/audit): paste a feed URL or upload a file and get a scored report of what would be rejected — missing barcodes, undersized images, price and availability problems. No account needed. - [Service status](https://www.feedrobin.com/status): last successful sync per platform, push status and recent errors. ## About the product - [FeedRobin](https://www.feedrobin.com/): what it does, which channels are included and what it costs. - [All guides](https://www.feedrobin.com/guides): the index of the pages listed above. - [Security](https://www.feedrobin.com/security): how store data is handled. ## Optional - [Privacy policy](https://www.feedrobin.com/privacy) - [Terms of service](https://www.feedrobin.com/terms)