webview.getSettings().setJavaScriptEnabled(true);
webview.getCertificate();
webview.postUrl(payment_page_url, getBytes(post_data_for_pay, "base64"));
webview.getSettings().setDomStorageEnabled(true);
webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
webview.setWebViewClient(_a_webview_client);