I am looking to have an iPhone/Android app built that will be able to: -Use GPS to show the customer where different modules are located and lead them there. -Have two types of accounts (a customer and a passive seller account). -Connect to an Arduino and relay to switch on something after payment. -Keep the relay in an "On" position for a given amount of time, based off of amount paid. -Allow to have more of the Arduino modules added over time. -Show the customer if a relay on the map is currently on and if so, for how long. -Show the passive seller their monetary balance based off of how many hours the relay has been on.