I'm not sure the difference between a portable and a kiosk. The cabinet is about 5' tall and 24" wide and will be bolted to a wall, it is to have a receptacle and data jack inside for the equipment which gets installed be the vendors techs. The more I look into this the more confused I get.
The receptacle is not accessible to the public so Art. 210.8 would not apply, but Art. 422 may if it's considered a vending machine. ATM's meet all the definition of vending equipment but the gray area is that the UL standards for vending machines are UL 541, UL 751. ATM machines are listed under UL 60950 Banking Equipment.
To play it safe I'm thinking a GFCI breaker is in order.