Become a master of your machine equipment so you can reduce down time and keep your accounts happy. Once you get them on the phone, the best strategy to set the appointment is to come prepared to deliver information that is highly personalized, relevant, and powerful. Product Optimization. Without experience in vending, this process may take up to a year before you get up and running with a couple of machines. Key Takeaways Great customer service is the key to building lasting relationships with your location. Some look like legit ways to break into a Coke or candy machine, while others may be too good to be true.