The port the backend should listen on.
The Base URL address of the proxy. You should use https://github.com/FireMasterK/http3-ytproxy for this. Each instance of the backend should have this on a different hostname for maximum bandwidth.
The base of the URL of the captcha solving service. In most cases, you would use https://api.capmonster.cloud/ or https://anti-captcha.com/
The api key to use when connecting to the captcha solving service.