As a vendor or contractor, you must register online to do business with the City through the Payee Information Portal (PIP). List of all current AIA Contract Documents.Learn what a vendor contract is, what should be included, and how digital contract management can help streamline your processes. Establish clear terms and conditions with vendors using our vendor agreement template. Create your agreement! Relationship of the parties: Your agreement should reiterate the fact that you are not an employee of your client and you are not forming a joint venture or. This is when you use an existing contract to acquire the same commodities or services at the same or lower price from another public entity contract. Use this legal vendor agreement template to ensure that new vendors are aware of the terms of doing business with your organization.