A “certified cash register” system will apply as from 2 January 2016, under which all legal persons and individuals that carry out cash (or cash-equivalent) transactions and are required to keep books and records will have to use certified tax registers (unless specifically exempted by statute).
The certified cash registers will be electronically connected to the tax authorities’ central information system, so invoices can be verified and saved on a real-time basis. The Ministry of Finance has clarified that where payment is made through a payment service provider, the invoice will not be subject to the fiscal verification procedure.
Source: Deloitte
Read more about Slovenian certified cash registers: http://www.salesdatacontroller.com/slovenia/
