Two-factor authentication is a security measure that requires that you authorize a login or transaction a second time as opposed to using just your password. Typically, 2FA can be in the form of SMS authentication, or you can use your payment solution’s mobile application. As you can see, it ensures that you are the person trying to perform the given action. This means that your account is, all in all, far safer than it would be if you do not use 2FA. This is why it is a requirement at most prepaid card websites, as well as all banking institutions.