I have worked with Nationstar, and they are great to work with. Pay CFK reimbursement to the agent by wiring the amount to your account same day you give occupant the check. Want Occupancy check about 30 days before foreclosure sale, and weekly updates- then they give you reo lisitng when if/when they own it as REO. The listings have dried up here in AZ, but I am in touch with them, and would surely work with them again.
They use Equator, and found me there. I don't think I ever signed up with them other than reotrans/Equator.