Add sync support for GTIN, UPC, EAN, ISBN fields

[paulostp]

With the addition of global_unique_id (labeled GTIN, UPC, EAN or ISBN) in WooCommerce 9.2, some merchants now have the expectation that this field will sync up with the respective field on Square's end.

That field appears to be part of the CatalogItemVariation object in the Catalog API:

https://developer.squareup.com/reference/square/objects/CatalogItemVariation#definition__property-upc

[jeffpaul]

@vikrampm1 this is probably a good issue to pull into the real-time sync project

[lynnjat7]

Just pinging on this issue @jeffpaul as I see it was marked as Priority: Low. However, without syncing the UPC codes, this means that merchants who use Square for in-person transactions are blocked or limited from processing transactions.

The UPC code is used by in-person scanners to set up orders quickly and manage stock; without these codes, in-store shopping is much more difficult.

Is there any way we can bump this up in priority?

[lynnjat7]

9529557-zen

[thuautp]

10531708-zen