It's probably a shitty business like Vector, much like what Lee said. This is a basic rundown of their scam:
You go to a training session/workshop/information briefing or whatever they call it, and you aren't payed. They basically tell you you're going to be selling something (usually knives), and that it pays extremely well (based on your performance), they'll tell you how some summer kid made $20,000 in two months, and how it'll be one of the greatest experiences of your life.
Then they single you out at some point, usually pulling you aside and say you have a real talent, or that you look like you would be a natural to make you feel special. Skip ahead, you have to buy from them their demonstration kit of whatever they are selling (how they make money), and encourage you to give them names, addresses, numbers to family/friends, which they can use or sell to other people for profit. They also encourage you to practice your sales pitch to people you know, because they know that it's a decent chance a family member will buy something to try to help out.
It's a huge fucking scam, and honestly, if after the interview phase they want you to go a workship/briefing in which you aren't paid, that's a big red flag. I would just nix this opportunity because it's likely bullshit and look elsewhere.