Raspberry pi phone charger for charity homeless people

Hi. I want to make a phone charger with RPI for homeless people. I think i have all the parts for it now but need some help with the program side of it all. Basicaly it will have a relays, timers, finger print reader. payment using square. etc The charge is to be set at $1 but that secures the box for charging. Im doing this for free to help the homeless so hopefully someone can help me with some skills over the next 2 months to put all this together. I know a little bit about rpi but not enough. Thanks