Receiving Authorization Response in iOS

To receive the authorization parameters and pass them to your secure backend, configure your button delegate to ZenKeyAuthorizeButtonDelegate and handle buttonDidFinish(). If the user approves your request, it calls buttonDidFinish() with a .code result. The authorizedResponse includes the authorization code, mcc, mnc, redirectURI, and codeVerifier for you to send to your secure backend. You must also handle any .error or .cancelled result and inform the user that authorization was unsuccessful.

extension LoginViewController: ZenKeyAuthorizeButtonDelegate {   
      func buttonWillBeginAuthorizing(_ button: ZenKeyAuthorizeButton) {
       // Perform any UI updates like showing an activity indicator.  
     }  
    func buttonDidFinish(  
            _ button: ZenKeyAuthorizeButton,  
            withResult result: AuthorizationResult) {  
           // handle the outcome of the request:  
           switch result {  
           case .code(let authorizedResponse):  
                let code = authorizedResponse.code  
                let mccmnc = authorizedResponse.mccmnc
                let redirectURI = authorizedResponse.redirectURI
                let nonce = authorizedResponse.nonce
                let context = authorizedResponse.context // string
                // Pass these identifiers to your secure server to perform a token request  
            case .error(let authorizationError):
                // There was an error with the authorization request  
            case .cancelled:  
                // The user cancelled their request in the ZenKey application  
          }  
     }
 }