Starting July 1st, Shopping.com will expand their list of required fields to 9, up from the three that they have now:
Generally merchants across all shopping engines should have these 9 populated already, so it shouldn’t affect too merchants who currently are on Shopping.com–but certainly it is worth one’s effort to verify that everything is put into place.
Merchants who sell apparel should also be cognizant of additional custom attributes that they can be including within their feed as well.