Load testing an application with multiple concurrent users

We have an application with no anonymous users. So you have to login first via a REST call to a login endpoint to get an identification token and then we would like to load test several different application endpoints using that token, to represent a user performing a task that takes multiple steps. So the load test would be testing the system being used by many different users at the same time. We would have to be able to throw 50 - 100 different users at the application. The application only allows 1 active session by any given authenticated user.

Is it even possible to do something like this? We have searched around but haven't found anything helpful yet, so if anyone could shed some light on this we would be most grateful.