Technically, you can list with an ASIN instead of the Barcode. It is possible to submit this information through Linnworks, but we cannot guarantee that Amazon will accept this. The ASIN needs to be used as an Attribute and uploaded as an Extended Property.

In order to do this, you need to set the Product-id-type attribute in your configurator to a default value of 'ASIN' and then specify the Extended Property name for the uploaded ASINs in product-id.