For making secure transaction smart cards are used which are credit cards, debit cards, key fobs, and many other electronic devices use making payments. Contactless payments is fast and secure way to pay small valuables transaction costing 30 pounds and under this. These types of payments are increasing commonly on many local devices. The contactless device uses an antenna which transfer purchase information to and from the terminal when touched against a contactless terminal.
Many contactless devices, accepts credit cards will not necessarily have contactless indicator on them and may require to activate them. All you need it do verify yourself on your device before you make contactless payment, if you have a smartphone you may be able to verify yourself through a passcode or your fingerprint on your payment app, and then make a purchase for over £30.