RetailMeNot CVS rules

I would like to use a current RetailMeNot cash back offer to buy groceries from CVS, paying with a gift card and making a pickup order. Is this likely to work?

I checked through the offer terms and I do see an exclusion for purchases of gift cards. I don't see any other exclusions, but I know that a lot of cash back offers do exclude groceries.

I know some portals often exclude certain types of fulfillment options; I don't see anything about pickup so I figure I'm okay there.

I think the bigger potential problem is that I want to pay with a gift card. I've seen various behavior from different cash back portals. I've seen some that base it off the full purchase amount; some that deduct the amount you paid with a gift card; and I've seen some that claim to invalidate the whole thing when you pay with a gift card, although I haven't actually seen that happen. Any idea how this will work?

I will check through my retailmenot history to see whether I have any info to share on how it has worked for me in the past.