It is called an agent. They are the person who concurs and is approved to follow up for another, a central, to legitimately tie a person specifically business exchanges with outsiders as per an organization relationship.
The agent is the gathering who is lawfully approved to follow up for the primary in the key's business exchange. The specialist owes the primary a guardian obligation. This implies the specialist is committed to act to the greatest advantage of the main. The central owes the operator a few obligations too.