wifi vending machine that uses ubiquiti unifi access points

want to build a wifi vending machine that uses unifi ap's. that is coin operated and prints out voucher to thermal printer. basically its already been done but its not coin operated here the link: [login to view URL] a code is written to request vouchers to the unif controller requirements: 1. to modify the code or entirely new code to talk to unifi controller and request vouchers to print out. 2. must be coin operated like a vendo machine. 3 .i can modify code for the download/upload and bytes quota and validity of voucher (see uploaded sample voucher) 4. can install it in raspbery pi