In the Business Client Authorizations work the same as in the standard easy access menu:- you can use the existing PFCG infrastructure to assign authorization objects to roles.
The Business Client simply starts an application, and the application itself has to check whether authorizations have been correctly assigned.
To check that authorization assignments are correct, you can log on to the system with a user who is assigned the relevant roles, and use the standard easy access structure (which has the same navigation as in the Business Client) to test the applications.