Help wanted: how can I get video call work from this app?

[stunning0001]

First of all, thanks for providing this amazing sdk demo.
We need to integrate this sdk for the app developing now.

Here, where can I get apiKey?
let wxt = WXTKit(apiKey: "ABC123YZ456", authType: .wxtId)

where can I get recipient?
wxt.videoCall(navigationController: self.navigationController!, recipient: "abc@xyz.com", delegate: self)

Anyway I'd like to show working video call demo.