How to decipher productType field in POS order webhook

There is a field items.productType in the (Glossary - POS Orders)[https://developers.deliverect.com/page/glossary-insert-products] documentation page, which has a link to the list of possible values and their meaning, but the link is broken.

Our current integration is working, but I just want to be sure that in future that information will be available in case of any discrepancy.