Ok, so, Describe your requirements clearly and give them a deadline of delivery,..,they have to deliver on time..,that's the contact. You can't get anything done, if salaries are paid free, and no deadline and nothing specific to deliver.. These days nobody want to do anything on the basis of credit or future payment. No delivery, no payment and vice-versa. Nobody like the uncertainty of whether they will get their payments cleared later or not. That's much better,.,they can go bed without unnecessary stress and sleep peacefully.😄🎈☕👍.