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If you're in the US, then I can recommend privacy.com

My current bank (Wise) also offers virtual debit cards. I am in the UK now and Wise works well. I still use both since I still have my American bank account though.

The bank's smartphone app?

Not all banks have these unfortunately, even though one time virtual cards should really be the standard for all online purchases

Yeah, sadly. But really it's the best way to do virtual cards.

If a bank doesn't offer these, next best thing is to go to the bank that does.

I use Mercury as I expense most subscriptions for business.