Wow, that's too bad... Did you ask WebCon to adress this issue? We are investigating the following alternatives: a) https://nip24.pl/ - they were only supporting XML but after our inquiry they also added JSON. It's tested, it works in WebCon. b) https://transparentdata.pl/zrodla-danych-polska/
Hi Michał, Did you finally manage to get the REGON (GUS) SOAP API to work with WebCon? Would you please mind sharing the solution? Best, Marcin