What is a one-time code?

The one-time code is one of two required authentication factors within the two-factor authentication, which is required according to the European directive PSD2 (Payment Services Directive Two) for customer authentication by September 2019. The one-time code is generated by a so-called authenticator app, which you install on your smartphone or other mobile device - similar to the transaction number (TAN) in a banking app - and is requested by Leondrino at login in addition to the access data (username, password) and for token purchases or transactions with Leondrino to authorize payments. The objective of PSD2 (Payment Services Directive Two) is to make payments on the Internet safe.