Product IDs can be reused, including:

  • UPC
  • EAN
  • ISBN
  • ITF
  • Non-categorized Product ID

If you need to create a new product ID for your product, you can use the Check Digit Calculator in order to ensure that your UPC is valid.

SKUs cannot be reused - all SKUs must be unique. 

Reusing SKUs results in product creation issues, as well as fulfillment confusion.