Hello,
Thank you for your question regarding ISBN-13.
There is no need to convert your inventory from 10-digit ISBNs to 13-digit ISBNs. The Marketplaces have already implemented the capability to match items to the corresponding 13-digit ISBNs.
For new listings that have been assigned only 13-digit ISBNs, you will want to import those items into FillZ using Amazon's EAN code (4) as the product-id-type instead of the ISBN code (2).
If you have any other questions, please do not hesitate to contact us.
Thanks! --
FillZ
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