To simplify warehousing and inventory management, every product sold online is given a unique identifier code. While many different formats exist, including UPC, EAN, GTIN, and ISBN for books, Amazon uses Amazon Standard Identification Numbers (ASINs), 10 unique digits of letters and/or numbers to create its unique product identifers. Every listing on Amazon is required to have an identifier. ASINs are created after you fill in all the item information, which includes the Product ID (UPC). If there is already a listing with same exact item, you can list using that ASIN. . UPC is the most common type of identifier, and its structure is as follows:
- The first 6 digits identify the manufacturer.
- The next 5 represent the item number
- The final digit is a check digit that ensures the code was scanned correctly
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