How can I activate my card in order to make online payments?

Ask your bank or savings bank to activate it. Each one has a different ID checking system. Some send PINs in SMSs or using a “battleships”-type system (Laboral Kutxa); others (such as BBK and Kutxa) use the CECA system VINI, for which purchasers have to use their ATM code to identify themselves beforehand. After that you will be able to carry out your payment without any difficulty.