E1 v.2019.1 now has the ability to keep the registrations of the external (Community) users in the database.
The community users are usually the clients of the companies, using E1. Or any other external party, which registers on the web site of the user company (e.g. the company, which is using E1).
It is suggested, that all future developments of web sites use this centralized user directory for logins.
The /id/ site contains methods, which allow external users to create profiles and login. For more information about integrating with the /id/ site, see the developer documentation.
The community users directory will be utilized by all web sites, integrated in E1.