On their website, go to the sign in screen and click “Need help signing in”. Go through the prompts and watch the persons username, and the legal name of all their employers (who have never used ADP) appear on the screen.

Note: Whether or not you select “my current employer uses ADP”, it will still show you the full list of both current and previous employers (who use ADP).

From there, it is remarkably easy to gain access to paycheck information if you are a grocer, a landlord, a retailer, or anyone of the 2737429193 entities who may have a little extra data on them.