I just tried generating 5 numbers without problem. It seems you can generate as many as you want. You can set expiration time and daily spending limit for the

I just tried generating 5 numbers without problem. It seems you can generate as many as you want. You can set expiration time and daily spending limit for the numbers. Also optionally assign a name for each number. Note that I have two Citi CC but only one card has this service. So some card may not. The one available to me is the double cash card.