Version 1.3.0 user group permissions

[Tezarin]

Hello,
I have upgraded my Docker based Guacamole installation to 1.3.0, in the 
previous version, I had used a user sync script to allow my corporate LDAP 
users authenticate with their LDAP credentials. 
I understand the version 1.3.0 has some built-in features which eliminates the 
need for using user sync script but wasn't able to find any documentation on 
how to implement that. Can someone please shed some lights on this and let me 
know where to start?
Thank you in advance