BANCO DE LA NACIÓN ARGENTINA

Careful, now. There are few ATMs in Puerto Iguazù. In theory, you can pay with credit or debit cards in most stores. In practice, this is not always the case. So you have to either come with currency that you will change at the airport or in exchange offices.https://www.argentino.com.ar/puerto-iguazu/casas+de+cambio

In Iguazù National Park, on the other hand, ATMs can be found. Otherwise, real is accepted.