So how much do I get if a players spends 1$ worth of money in my game's in-app purchase?

Hello, I am considering porting my game to Kongregate (or to other platforms) and I am comparing them.

I couldn't find the direct answer to my question: how much do I, as a developer, get if a player spends 1$ worth of money in my game to get an in-app purchase?
In this case, do I have to use Kegs or should I collect the payments with an external service like stripe? Thank you!