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What the authorities receive, once the host uploads

Croatian law (Zakon o boravišnoj pristojbi; Zakon o pružanju usluga u turizmu) requires every accommodation provider to register every overnight guest in a national system called eVisitor, run by the Croatian National Tourist Board. For each guest, eVisitor records:

• Full name and sex
• Date and place of birth (country and city)
• Citizenship
• Address of residence (country, city, street)
• Travel document type and number
• Date and time of arrival and (foreseen) departure
• Tourist tax category that applies
• How the guest arrived (organised, individual, etc.)

That data is shared with the Ministry of the Interior (MUP) for border-tracking and with the local tourist board for tourist-tax accounting. The same data would be required at any hotel reception in Croatia. For official details, see evisitor.hr and the eVisitor wiki.