you have activated Toucn ID in your Buypass Code app
How to activateTouch ID/Face ID in your Buypass Code app
Be sure that you use the latest version of Buypass Code
Follow the messages on your phone and click Yes on the question - Do you want to activate Touch ID / Face ID
...or click the gear Settings icon on the bottom of your screen in the Buypass Code app
Buypass Code supports Apple Watch.
By using Apple Watch you can easily get a new one-time-code (OTP) - or accept the PUSH messages if PUSH is activated - directly from your watch without opening your mobile phone.