Pittsburgh is a fine city, Azizzi. Purgatory is located in the Mellon Bank Center, in the city's downtown, in a section devoted to something called retail lockbox.
In a chilly room, done in unrelieved gray, temps sit, and look at checks and look at forms, then they look at checks, then they look at forms.
I know because I worked there once. Fortunately not for long.
I know it was purgatory because I got out.