Two-Factor User Authentication
About Two-Factor User Authentication (X-Payments Cloud)
Setting up User Authentication with the Google Authenticator App (X-Payments Cloud)
Setting up User Authentication with SMS/Text Messages (X-Payments Cloud)
Setting up User Authentication with Backup Codes (X-Payments Cloud)
Setting up an Additional/Alternative Method of User Authentication (X-Payments Cloud)
Changing Your Preferred User Authentication Method