Since the barcodes are coming ftom the manufacturer how you can make sure they are all unique? With you scan a product you need to make sure it’s unique
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They don’t. The barcodes used in retail stores are Universal Product Codes (UPC), and are issued by the global standards organization: [GS1](https://en.m.wikipedia.org/wiki/GS1). GS1 makes sure the UPCs are unique for currently registered items.
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