How do I get paid for bringing a buyer?

[Jonathan Guerrero]

So I might be closing on my first deal today.  I called a bandit sign and introduced myself to the wholesaler.  I told him I'm new in this business but knowledgeable and I'm looking to grow my network and possibly partner up on some deals.  He had one. I told my buyer about it and negotiated.  He's buying at 90k but there's no room for me to buy cheaper and reassign it at 90k. I know we unofficially partnered up and it should be a 50/50 split by bringing a buyer but I know that won't happen. 

I still don't know what he has it under contract for but my guess is 70k max 80k.  What would be a fair cut for me?

How should I approach him about this?

Don't want to sound overconfident but I don't want to get taken advantage of either. 

Your help is greatly appreciated.

[Ryan Dossey]

In the future.... Work that out BEFORE introducing anyone to anybody. This guy could just cut you out of the deal and there's nothing you could do. Don't make that mistake again!