We recommend authorising online payments via BT Pay. 

It is a simple and secure method that complies with European rules on transaction security. 

With BT Pay you can authorise payments over the Internet using your phone's unlocking method (fingerprint, FaceID, PIN, pattern, etc.) as follows: every time you make an online payment you receive an instant notification on your phone and you simply confirm the transaction in the BT Pay app. 😎