A sales partner agreement is a contract that exists between multiple business partners and is used to define what the responsibilities of the company are. It also lists the profit and loss distribution for each partner, as well as what the rules are about the partnership in general. When two or more people decide to operate a for-profit business, even if it's just family and friends, they should create a partnership agreement.
This should define what the nature of the relationship is, as well as express the responsibilities and expectations of either party. The agreement should discuss all compensation timelines and structures, as well as what the agreement termination procedures and terms of engagement are. All authority should be specified and instances defined when the partner needs to talk to the organization before they can take action.