Simple wire transfer. Some time later they (or their lawyers) will get a letter with IBAN number (idk about curia.eu, but in Poland the account would be in cent

Simple wire transfer. Some time later they (or their lawyers) will get a letter with IBAN number (idk about curia.eu, but in Poland the account would be in central bank). Also a wire title which they need to add to wire order so the transfers can be identified. It doesn't need to be a single transfer, but all of them need to arrive before stated date. Again idk about this particular court, but also in Poland (and I expect most EU countries) they're also allowed to pay at the counter with a "legal tender" (cash and some limited legal papers like promissiory note), that is, they're free to dump truckload of coins at the main entrance, should they procure such an amount. Over here people do it sometimes to vent themselves if they loose a case. Typically police will get called, but it's the cashier's job description to count the money, and they can't require extra payment for that, so in extreme cases the office gets locked for a whole day.