Hm, I've been doing this for years. My bank lets me create virtual MasterCard credit cards that can either be one-time use only (they "auto destroy" after one p

Hm, I've been doing this for years. My bank lets me create virtual MasterCard credit cards that can either be one-time use only (they "auto destroy" after one payment is authorized) or can be set to expire after a certain month or a certain amount of money is spent. They're linked to a physical card and/or bank account that you never disclose, and you get an SMS notification for every transaction. Not sure what's the novelty here?