Currency in Spain / Barcelona is the euro €. You get cash around the clock with the Maestro (EC) card and credit cards at countless cash points in the city.
Many banks have their cash points in a small anteroom, which can be closed.
Pay attention - like everywhere else too - nobody looks over your shoulder or any manipulation of the machine has taken place, when typing in your pin number.

Credit cards are accepted almost everywhere, particularly in hotels, department stores and restaurants. Note that most institutions charge a fee for the foreign use of the card. Please check on your contract.

If your credit card is lost, you can contact the service and emergency centre. For MasterCard and VISA cards the contact number is:
MasterCard: 001 - 63 67 22 71 11
Visa Card: 001 - 410 581 3836