The clinic charge in Polish Zloty and in Euro. Our prices are in Euros, and it is usually a less charge to make the payment in Euro. The clinic accepts both debit and credit (Visa and Mastercard), you can pay with cash or you can pay via bank transfer.
What is the best and most reasonable depends somewhat on the type of bank you have at home in Ireland. Usually we tend to recommend to pay by card (Visa or Mastercard), especially if you have good credit ,this can be absolutely the most affordable way to pay especially if the exchange rate is not so good at the time of your visit in Krakow.
If one wants to pay in cash then it is of course possible.