How the realtor gets paid when owner financing?

[Luis L. González París]

I'm attempting to purchase a triplex through owner financing. I have done my research but it seems that everybody forgets to explain how the realtor gets paid in this transaction. I know that has to do with the listing terms between the seller and the agent, but let's say I only have $5k for EMD and no downpayment, and the owner has no money. How can he come up with the realtor's commission when owning financing?