If you are not a client of Banco de la Provincia de Buenos Aires, or Cuenta DNI, you can open an account through this app with only a single ID.

If you already have an account with the bank, then you can link it up with the app, so that you can use your money digitally - which would then allow you to:

You can send and receive money using only your ID number, purchase items and services from shops with only the DNI or QR code, approve your Banco Provincia cards - credit and/or debit. You can also withdraw your money at the ATM's without the need for a debit card.

With Cuenta DNI, you can also transport cards and your cellphone, your DirecTV subscription as well as Visa. You can also supervise the movement of your account, to ensure that nothing fishy is happening.