This user manual provides detailed instructions for completing the Qualified Vendor Contract application. Know about: Information required before drafting the agreement; Essential clauses that need to be covered in an ecommerce vendor agreement.In order to do business with the State of Arizona, businesses are required to register an account on the Arizona Procurement Portal (APP). We'll help you craft the best vendor contract agreement for your specific needs, and help you manage that relationship as long as you need it. Thanks for reaching out to ClassWallet. Starting a food vending business in the Grand Canyon State requires more than a delicious menu and an entrepreneurial spirit. Transaction privilege tax (TPT) is a tax on a vendor for the privilege of doing business in the state of Arizona.