True, but if the FDA is sending warning letters to giants like Go Daddy and PP, won't they do the same for cc companies? Can they do it? Will they comply?
CC copmanies are allowed to collect paypment for vape prodduct because vape is not, as a category, illegal. The problem now is that some vape is illegal (no PMTA or rejected) and some vape is not (PMTA pending/approved).
So credit card processors would have to spend a lot of money making a database of UPCs and such so that only FDA approved UPCs can be processed. This is simplified, it would be a lot more laborious than that. As such, the FDA cannot really urge CC processors to only ban transactions for certain UPCs.
The only thing that can happen is certain big processors can, if they want, decide to drop vape transactions altogether. But since it is not illegal, the other processors will just pick up the new business. One such processor did that a couple years ago. Nothing to do with the government, they just decided to drop vape merchants. I wish I could remember who that was, but I remember they were a rather large player in the merchant processing world.
Vape is already categorized as "high Risk" so that avenue has already been visited years ago. Vape shops have to pay more now, but at least they can take your credit card. Just like with Firearms sales and other high risk categories.
I personally don't see non-3rd party processors (like Paypal) dropping vape en masse. There's money to be made there.