@Override
    public String getIdentifier() {
        return "totp";
    }
Creates a new TOTPAuthenticationProvider that verifies users using TOTP.

@throws GuacamoleException
    If a required property is missing, or an error occurs while parsing
    a property.
extensions/guacamole-auth-totp/src/main/java/org/apache/guacamole/auth/totp/TOTPAuthenticationProvider.java