Can you tell me how to operate Road trip car rental, refueling and parking in Croatia? Are they all self-service? Can I use credit cards ?

Pump up gas is to get a card when entering the expressway and pay when exiting the expressway. You can use cards and cash. They are usually manned, and occasionally self-service. Parking varies by location. It is usually self-service. You put coins into the parking machine. I haven't seen credit cards.

Self-service is cheap. There are several ways to pay for gas. The easiest way is to remember the gun number when you first pump gas, and then tell the number to the staff when you finish and pay. Credit cards with Visa are acceptable. The gas will be automatically deducted after you insert the card (in some cases, more will be deducted if you pre-authorize). The most troublesome thing is to estimate how much money you need to pay. You need to first put in the money, then pump gas, and you can't get a refund or compensation. When you enter the parking lot, you need to get a ticket first. Before you leave, you must find the machine, insert the card, and pay the money. After paying, insert the ticket into the machine and lift the boom to leave.