With the advance of tehnologies being used for digital payments, vending machines which once accepted coins and/or cash are now in danger of becoming out of date. With the advances of technologies used for sending/accepting money we need to keep the vending machines advanced enough to support that. In the case of software obsolescence the problem is easily solved with a simple update of the system code while in the case of hardware obsolescence we need to update both the software and hardware components of the vending machine. In this paper, we showcased both of the aforementioned procedures using the Raspberry Pi computer and the Keks Pay application. The Raspberry Pi computer was used for PHP server and vending machine communication and also transaction logging. Keks Pay was used because of its usage in Croatia and it also supports both static and dynamic QR codes. Even though this paper covers both functionality and implementation of both kinds of QR codes, this paper opted for using dynamic QR codes in the end due to the ability of using a LCD screen during the development of the project. In cases where that is not an option we can use a static QR code and we will be able to implement payment with Keks Pay on the vending machine. With the current rate of adoption regarding digital payment systems into modern society I feel we could soon see a sort of financial digital age where cash loses relevancy the further we push technology forward. The reality is cash is not easily transferable, protected or secure on the level of digital money/transactions. Lately, we have seen the growth of cryptocurrency which I personally think will be the future of digital payments and I hope that this paper or a paper like this will be additionally expanded by me in some future moment.