Loan servicing agent
One who handles the interest and principal payments, monitors covenants etc. on behalf of a borrower. An unglamorous role; part of the pluming of the financial system for which the agent is paid a mere annuity, and with respect to which the agent accepts as little risk as it can. Which, whatever your documents say, can be quite a lot of risk, if you are in the habit of accidentally repaying almost a billion dollars of principal to lenders when it isn’t due.