Just landed two commercial bids a little over a week ago. Each one also wanted a small landscape refresh done. I put in the bid that the first payment of 50% of the total, had to be paid prior to start date. The remainder would be paid upon completion. I didnt start on it yesterday because I never received the first payment. Today was the schedualed day to finish the project but im not sure if I should go ahead and do so without them abiding by my terms. Alot of the money is going toward material to get the job done. What would you do?