ShipStation has a option to add a UPC in standalone product details. It would be helpful for multiple reasons to have the option to add this feature on a picklist in "Printer Settings - Picklist - Document Options". This would allow one or multiple marketplaces to import orders with a different identifier and have the possibility of having a "Master UPC" as a reference.
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Applying UPC (Attributes) to Picklist - Document Options
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