When integrating an application with the Lequinox platform, the application most likely wants to keep track of user accounts with metadata and use the ApplicationAccessID to link users when signing in. Other data important to keep in the application is the privateId and corporateId used when adding participants to transactions.
Also, corporate roles are associated with an organisation, and these organisations also have a corporateId. To create an access, the corporate role account does not need to exist in the same Lequinox platform as the one the application is connected to.
For more information, go to the User object section.