We can easily integrate a key pad or bar code reader to do what you want to do, but the real issue is finding the controls company that can provide all of the hardware and software integration required. I talked to the people at Exacta about this in Nashville, because they always had a key pad system, but they would only do it if you (the wash owner) also used their pay station or entry unit... so it is much more of finding the controls company you want to use that can give you what you want, and then working with the vacuum manufacturer to integrate that hardware into the vacuum unit.