CieID is the app created by the Poligrafico and Zecca of the Italian State to provide access to the PP.AA. Italian services and services revoked by EU member states in accordance with UE 910/2014 eIDAS using an electronic identity card (CIE 3.0).
The app is available for smartphones with Android 6.0 and later operating systems that have NFC interfaces.
While using the app for the first time, register your electronic identity card by entering the eight-digit PIN, then transfer it to the requested device so you can later authenticate your access to services.
You can get an updated list of services offered at the following website: https://www.cartaidentita.interno.gov.it/erogatori-servizi-abilitati.
Keep in mind that the Community will provide you the first half of the PIN in response to the CIE's request for its release, and the second portion will be summarised with the Cart.
Visit the website for the service you want to access, choose the "End with CIE" authentication option, and follow the on-screen instructions to confirm your identity with your electronic ID card.