This library can help you with fetching flex queries from Interactive Brokers.
Simple call the library by passing your token and queryId:
... FlexResult result = new Reader().GetByApi(token, queryId).Result; ...
Or pass an already downloaded file:
... FlexQueryResponse result = new Reader().GetByString(content); ...
This is the repo that creates the site you are looking at currently. So if you are interested in the technical background, this is the project you were looking for.
This repo contains all the stuff from kack.dev. A page where I am publishing cartoons related to the developer life. Most of them will be in German. The wording
kack dev means something like
bad developer and has some kind of ironic meaning.