If you have handmade/custom listings, then UPCs are not necessary. But if you are selling products manufactured by a company like Hallmark, for example, then you would have to include a UPC if the product is new. But if someone has the UPC, whether it be new or used, then it is best to use the UPC.

For handmade/custom you will not have a UPC though.

What Bonanza will automatically do is apply the attribute_identifier [URL removed] attribute so that Google shopping will know your item does not have a UPC.

BUT, I personally think as a back up that it is a good idea to put something in your titles to indicate your decal is custom.

You can see that this attribute has been applied to your listing by going to the Selling on your upper left corner of this page and then click Batch Edit Items from the dropdown. Then once on that page, click on Search Optimize and you’ll see that it has been applied to your listings.

Every so often Google shopping will still disapprove a listing even if Bonanza uses the identified exists false attribute………..that’s just Google shopping being moody.

You [URL removed] What’s the difference between a UPC, MPN and EAN?

Here’s a Google link that can help you with this. They explain it better than I can.
[URL removed]

All the drones at google were born AFTER UPC codes came into fashion (1974 and 1963 for 5 digit ZIP codes) so as far as they are concerned, EVERYTHING has a UPC because they don’t know any different. Many of my items are PRE-UPC but 2 sites that I try to search to find similar later versions of the same product to find a UPC (to satisfy Google madness) might be of some help. They are….

www.upcitemdb.com/upc and www.barcodelookup.com/

Of course, there still will be some not founds on either of these sites.