Please download a 2FA app., such as Google Authenticator and follow the different steps.
You will find on this link all the details to download and set up Google Authenticator.
To activate it on Paymium, please log in to your account and go to your profile to the 'Security' tab.
Please click on 'Activate' and then scan the QR Code on the screen or enter the code manually (you will find it under the QR Code).
Once your 2FA is recognised, please enter the 6-digit code found on your application and click on 'Validate' to confirm the installation.