Welcome to the Niyo Community! 
We understand your concern about online security! 
Virtual debit cards are only active during onboarding and until the physical card arrives. Once you receive the physical card, the virtual one is disabled.
For one-time online usage, we currently don’t have an option for a virtual card, but I recommend enabling transaction limits or locking your card through the app after usage to prevent misuse. 
Let me know if you’d like assistance with setting that up! 
