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Read onlyWhere do I get the FNSKU barcode and is the only the barcode I put on the packaging (Not UPC code)?
When creating a listing the system attributes the FNSKU for each listing. It's preferable to stick the FNSKU on the packaging, but you can also put the UPC. The one OR the other, not both.
Go quickly learn how selling on Amazon works. In your seller central scroll down, find "Learn", click "Seller University". Take 4-5 weeks and watch the videos.
@Seller_rI7BZIczK8iACis right on here, @Seller_kpi66oI9ACSuA- you may want to also check out this post on barcodes types and requirements as well as it has some other tips and resources.
Feel free to reach out if you have any other questions on this topic though!
-Danny