I have over 50,000 products in Magento version 18.104.22.168 and I want to list them on google shopping.
My question is, are there any Magento extensions that will automatically generate GTIN numbers for all the 50,000 products I have?
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u can create or get list or csv file for all those products and u can create array or object . by creating external data script, within that script u have to load all customer and by id of that customer u can check for GTIN no. to that product and update field in Database with that script.