Yeah but if you send a card for, say, $100 and Null uses it to buy $100 in Amazon gift cards, that would meet either card's condition without telling you much.I’m going to keep beating this drum. From the app:
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These are the only two options for making a card in the app or online. Either a card that you can use only at one place, or a card that you can use for a single transaction and never again.
Also, if I send you the number for a Privacy card on my account and you use it at, say, your local Mcdonald’s by typing in the number, I see the transaction and depending on how much location data accompanies the transaction line, I now know where you live. Privacy cards hide information from the payee, not from the accountholder, who sees the payee info both on their Privacy account and on their bank statement.