Required documented information

"My inquire is about custom clearance activity, I don't find any requirements for ISO9001 for that topic .... we have an employee deal with service provider which will make custom clearance activity till the goods received in warehouse so it only (service provider selection, evaluation) that should be documented and implemented. My question is do I need to make in details procedure for the key-person who handle communication with custom clearance service providers and that procedure describe details about how our employee deal with service providers and with financial dpt. to pay for the service which is very logic and doesn't produce mistakes.”