Sell on Amazon without GTINs or UPCs
Briefly

Amazon's marketplace mandates that sellers provide a product identifier, such as UPC or GTIN, to list items. However, some products, like print-on-demand items, handmade goods, and small private label offerings, may not have such identifiers. In these cases, sellers can either obtain a GTIN or apply for an exemption from Amazon. GTINs help manage inventory and streamline order processes, but for unique products without barcodes, an exemption process is available, provided specific conditions are met.
Identifying products without a Universal Product Code (UPC) can be challenging for Amazon sellers, particularly for handmade or private label items that often lack identifiers.
For sellers dealing in non-traditional products, Amazon provides an exemption process which allows them to list items without a GTIN, but this requires specific guidelines to be followed.
Read at Practical Ecommerce
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