Openinverter is an opensource project, i.e. there is no large company behind it that has paid employees. Therefore all products that you buy in the openinverter shop, the EVBMW shop or that you order yourself from a PCB manufacturer are self-supported. It means you need to research the needed information on the forum or on this wiki.
The developers are well aware that this research can be a show-stopper. Since we don't want people to get stuck in their project there are paid support options: