How does a new bank card know whether you have entered your pin once to then activate contactless payments? And how did all bank cards know when the contactless limit on card went up from £30 to £45 in the UK?

Question

A customer asked me this at work and I didn’t know the answer!

In: Technology

Answer 1

The bank card itself holds just about enough info to identify which account to send the bill to for any transaction. The card reader and bank handle all the heavy lifting and remembering the rules.