         super.viewDidLoad()
         setupWebView()
         setupIndicator()
+        addCloseButton()
     }
 
     override func viewDidLayoutSubviews() {

        }
    }

    @objc private func closeWebView(_ sender: Any) {
        let alert = UIAlertController(title: Define.String.quitPayment, message: nil, preferredStyle: .alert)
        let cancel = UIAlertAction(title: Define.String.cancel, style: .cancel, handler: nil)
        let ok = UIAlertAction(title: Define.String.okay, style: .default, handler: { _ in

    // MARK: - Properties
    private var payment: AtoneCon.Payment?
    private var webView: WKWebView!
    private var scriptHandler: ScriptHandler!
    fileprivate var indicator: UIActivityIndicatorView!
    fileprivate var closeButton: UIButton!

    private var handlerScript: String {
