Guest registration and tourist tax brief for Croatia and Slovenia

Campsites in this region must register guests with public systems and collect tourist tax, and the rules vary by country and municipality. A booking platform has to know exactly what a campsite needs from it. You write a practical brief for Croatia and Slovenia, and for Montenegro if you know it: what must be reported, by whom, how fast, which guest data is required, how tourist tax is collected and passed on, and what exemptions apply. Deliverable: a brief with sources per country, and a list of the fields a booking must capture. Done means: each rule cites an official source, and anything uncertain is marked clearly. Must have: tourism accounting or compliance experience in Croatia or Slovenia, eVisitor or eTurizem, tourist tax rules. Nice to have: Montenegrin rules, Italian Alloggiati Web, VAT on accommodation.