I am from India. Recently I went to a store and bought some goods. After I was handed my bill, I gave the cashier my debit card. I was busy on my phone and didn't give it much thought, and to my surprise, the cashier thanked me and returned my card. I did not tell him my PIN nor did I receive any OTP. But the money got transferred.
When I inquired the cashier about the transaction, he said that there is a "Wi-Fi" in my card and that's why he did not need the PIN or the OTP. How is this possible? I tried looking it up online but could not find much information. Thanks in advance.