Yeah I know. This is why I’m holding back from releasing any documentation for API whatsoever. It’s not yet stable and endpoints can change. They didn’t for long time though.
This particular change is related to changes in Application Data folder. The businesses are no longer named after randomly generated UUID but actually what they are named in Manager. The business string in URL is base64 encoded business name.
If you are using server edition, have a look into your Application Data folder to see what I mean.