WordPress Logins

Here is what I am needing to do. I have a client who is wanting a list of employees to have an individual login and password for the sole purpose of having access to a digital copy of their paystub. They want an employee login page, that I have already made, and would like their employees to be able to login thru that page and see only their paystub. I have been trying to research this for two weeks now and REALLY need some help with this.