uses for virtual cc#(vcn)online for merchants you don't trust
for promos/deals that need different CC #'s.
recurring payment u don't want to recur
how to get a vcnFor Citi,
log into your citi online account > services > virtual account numbers and set it up from there. Make sure that popups are enabled in your browser.
For BofA
go your account history and scroll down until you see the ShopSafe link on the right side of the screen.