Amazon explicitly states they verify UPCs against the GS1 database. If your code's "Company Prefix" doesn't match your brand or the GS1 record, your listing may be removed or your account flagged.
Third-party "bargain" sites often sell "recycled" or "pirated" codes. These can cause "Product ID" errors during listing or lead to your products being merged with unrelated items. Alternatives to Buying UPCs buy upc codes for amazon
Most expert sellers and current guidelines strongly recommend buying directly from GS1 US rather than discount resellers. Amazon explicitly states they verify UPCs against the
Previously, GS1 was expensive (requiring a $250+ "prefix" for a bundle of codes). However, GS1 now offers single UPC codes for roughly $30 with no annual renewal fee, making them competitive with many resellers. These can cause "Product ID" errors during listing
If you are trying to avoid the cost entirely, consider these two paths: A Guide to Buying UPC Codes in Order to Sell on Amazon
Buying UPC codes for Amazon is a critical step for new sellers, and the "review" of this process has shifted significantly in recent years. While third-party resellers used to be the standard recommendation for saving money, Amazon's stricter enforcement of matching has changed the landscape. The Bottom Line: Buy Directly from GS1