Zeki: Oh! Saw those little trading posts I set up, didya? My little attempt to teach folks about more... legitimate forms of bartering.
Zeki: See, I heard you Humans have been gettin' real into trading lately, and I thought I'd help facilitate those deals.
Zeki: Course, I can't have just anyone conducting business on my grounds. So I've come up with a little quiz.
Zeki: Prove you've got what it takes to become a proper merchant, and I'll give you a trading pass and full permission t'use the stands whenever you want.
Zeki's informed you that in order to start trading plushies, you'll need to pass his quiz. He's set up "Quiz-o-Matics" around the Underground for you to speak to.
Zeki: Yep, got the info from my Quiz-o-Matic already. Cute little thing, ain't it?
Zeki: Anyways, I already got your pass printed out, so here ya go! Oh, and just in case you ain't got anythin' to trade yet, I've got another special reward for ya.
Zeki: Enjoy, pal, and happy trading!