I've been using this for many years with my Citicard Mastercard. I go to the Citibank website and get a virtual CC#, where I can set a $ limit and date limit (

I've been using this for many years with my Citicard Mastercard. I go to the Citibank website and get a virtual CC#, where I can set a $ limit and date limit (up to 12 months in the future).