A new ARES is accessable at location https://ares.gov.cz/, it provides REST API, so no longer will be need the XML communications. It also has a documentation https://ares.gov.cz/swagger-ui/. Currently is the new ARES in a pilot mode and according to the words from Czech ministry of finance it contains data until 30th of July 2023. But the old ARES will be running concurently with the new one until 30th of September 2023. And then the old one will gone.