Need Example

[kiranmaya]

hi, I'm new to c#,
here I observed that this project uses autofac , I don't understand the need for autofac builder here .cand you write one example implementation.
containerBuilder .RegisterClient<IHighFrequencyTradingApi>(myHftUrl) .WithApiKey(myApiKey);
I don't find any RegisterClient class in autofac .
in readme file
Note: Send your api-key as api-key header or as argument to the specific calls.
do we need to send API key here with HTTP client ,or will this lib do automatically.