The main form can be used to make a credit or debit. Typically, you just set the soda price an minimize it and use the right click menu on the system tray icon for credits and debits.
The log screen housed all you credits and debits. Its pretty detailed to help you remember a purchase. It automatically scrolls to the bottom for you so you don't have to.
This is the about menu, it is standard with all our other programs. You can check for updates or go to our website from here.