auth.swift

   let APIIdentifier = "http://google_api" 
        Auth0
            .webAuth()
            .audience(APIIdentifier)
            .scope("openid profile email")
            .connectionScope("email")
            .start {
                switch $0 {
                case .failure(let error):
                    // Handle the error
                    print("Error: \(error)")
                case .success(let credentials):
                    print("credentials: \(credentials)")
                    guard let accessToken = credentials.accessToken, let idToken = credentials.idToken else { return }
                    //print("accessToken: \(accessToken)")
                    HomeViewController.printToken(token: accessToken)
                    //print("idToken: \(idToken)")
                    HomeViewController.printToken(token: idToken)
                    SessionManager.shared.storeTokens(accessToken, idToken: idToken)
                    SessionManager.shared.retrieveProfile { error in
                        guard error == nil else {
                            return self.showLogin()
                        }
                        DispatchQueue.main.async {
                            self.performSegue(withIdentifier: "ShowProfileNonAnimated", sender: nil)
                        }
                    }
                }