How to implement Extensible Enterprise Single sign-on in ios13

We all know that Apple introduce Extensible Enterprise Single Sign-on Extension on iOS 13. Here is the demo video presented by Apple.

There are two types of Extension,

1. Redirect and
2. Credential

I want to work with Redirect Extension. The below code shown in demo video.

class ViewController: UIViewController {

var authController : ASAuthorizationController?
let authProvider = ASAuthorizationSingleSignOnProvider(identityProvider: URL(string: "https://example.com")!)

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
}
@IBAction func login(_ sender: Any) {
    if self.authProvider.canPerformAuthorization {
        let request = self.authProvider.createRequest()
        request.requestedOperation = ASAuthorization.OpenIDOperation.operationLogin
        self.authController = ASAuthorizationController(authorizationRequests: [request])
        self.authController?.delegate = self
        self.authController?.presentationContextProvider = self
        self.authController?.performRequests()
    } else {
        print("failed to perform authorization")
    }
}

}

How can I get the identity provider URL. So my question is that how to implement Redirect Extension in my app and how to add identity provider url.

Thanks in Advance.

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