This question asked if websites on which one is transacting have their payment information and from the replies it seems that they do (or at least their payment gateway service providers do). But my question is if a website (Twitter, specifically) can use the payment information they have to know if multiple users have used the same credit/debit card to buy multiple subscriptions (Twitter blue subscriptions, specifically) and that there's no kind of encryption in play that deprives them of this ability?
I guess one could use multiple virtual credit card numbers linked to one account and bypass any effort to find the multiple subscriptions bought from a single credit card but my question is limited to if they can figure out duplicates given one wasn't using virtual credit card numbers.