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I imagine ordinary 2FA probably wouldn't work... the timeout would have to be too long. But I don't see why 2-factor pre-authentication shouldn't work? Before

I imagine ordinary 2FA probably wouldn't work... the timeout would have to be too long. But I don't see why 2-factor pre-authentication shouldn't work? Before purchasing, just authorize a larger charge on your card than a limit you or your bank previously set. If it works, then great. Worst case is it doesn't work (app breaks, phone out of juice, whatever), in which case you're back to the current situation.

peteretep 8y ago
> I imagine ordinary 2FA probably wouldn't work. I don't know what you mean by "ordinary" 2FA, but it's pretty common in Thailand when making online payments to have an SMS sent to you, and in the UK my Amex card has been known to require SMS/email codes for online purchases.