the prototype ...

equipped with a 13-inch touchscreen and a Stripe payment machine accepting credit card payments

Internet connectivity via cellular network or wired connection, the machine can be installed almost anywhere

this fridge size allows for dispensing from 4 x 20 liters kegs, therefore is equipped with 4 taps

continuous connectivity to the server over the internet allows user account balance payments and monitoring machine states

volume measurement calibration and price of drinks is individually configured easily

beverage is kept at refrigerator temperature from the Keg to the end of the line at the taps

this machine is a proof of concept, the system could be installed on another fridge with different size capacity