I'm going to guess estonia which has had this since mid 2000's IIRC.

Latvia has it too. We have ID cards which is a smartcard, we use that to set up some authentication app that allows us to authenticate within online services and can even do remotely transactions like selling the house (well that is the extreme case and one needs to connect to teams meeting and show your face and have high quality video/connection and show your id card, along with digital auth). But anyways, it is used all around the place, many many sites support that auth, the banks support it and even remote auth scenarios are possible. Just today was calling mobile operator support and they had to verify me - so after saying my ID, an auth request pops up from app that asks to verify identity to mobile operator (app shows who is asking for auth).

Authentications are separated and if some signature must be placed or money to be sent, you must use other access code and the app shows the intention of what are you authorizing. If it is money being sent, you see where and how much you want to sent before you approve this request on the app.

But the app is all tied to digital identity from the id card in the first place - to set up these strong authentication guarantees in the first place you use your ID card. Some time ago we had to use computer with smartcard reader to set it up, nowdays I dunno whether it is NFC or something, but the mobile phone can read the ID card.