Can you please tell me how to pay for tolls on the highway from Prague to Budapest, passing through Austria, Slovakia, and Hungary ?

From Prague to Budapest, you only need to pass through Slovakia and Hungary, and you don't need to pass through Austria. You can buy high-speed tickets at the border. I remember that only cash can be used at the border between the Czech Republic and Slovakia. Visa can be used at the border between Slovakia and Hungary. I'm not sure about the specifics, so bring your card and euros. Generally, the shortest date can be purchased. Some require the presentation of vehicle information card, which will usually be prepared and handed over to you by the car rental company.