A three-step process for such a position? Who the hell do these people think they are? Fucking hell lol. Good luck anyway, but if I went for something like that and they said it was a three-step process, I'd be like bye.
Pretty typical for retail. You go in and fill out the application at the kiosk, a manager on duty looks it over and does a brief interview, then you do one with HR along with the psych/personality tests, and then there is an interview with a department manager. A lot of this is to weed out people because even cashier positions can have hundreds of applicants.