Went a few months ago, Citi paid the way, even took digital finger prints, most of the time I received Pre Check anyhow,
Was on BUF trip, and all 3 on my reservation received Pre Check..
They have a walk-in office in IND at the airport next to a food joint., and also some other locations in the city, in and out in about 10 minutes...
Sent a few friend, getting their KTN about 10 days.
Another money machine, for TSA.,
Look at it as a tip to cut the line...