[azthecx]

Portugal like many European banks already has a working solution to this for 20 years where you can create temporary card numbers and use that instead or, as of late, pay directly through an app that enables this same behaviour.

The Netherlands had a similar system where they used physical totp (I believe) terminals which generated them from your bank card + pin, completely offline. Nowadays everyone uses iDEAL identically to what you describe.

[Workaccount2]

We have had this in the US too for at least a decade, people just don't use them, probably because of convenience.

[Nextgrid]

Unless you can cap the amount it’s indeed pretty useless. Most systems like this that I’ve heard of do not allow you to do that.

[Workaccount2]

With citi bank I can cap the amount and set the expiration.