String PaypalURl = "https://www.sandbox.paypal.com/webscr?cmd=_express-checkout&token=xxxxxxxxxx";
wv_paypalView = (WebView)findViewById(R.id.web_view_paypal);
        wv_paypalView.getSettings().setJavaScriptEnabled(true);
        wv_paypalView.getSettings().setDomStorageEnabled(true);
        wv_paypalView.getSettings().setUseWideViewPort(true);
        wv_paypalView.getSettings().setLoadWithOverviewMode(true);
//        wv_paypalView.getSettings().setUserAgentString("Mozilla/5.0 (Linux; U; Android 2.2.1; en-us; Nexus One Build/FRG83) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1");
        wv_paypalView.getSettings().setUserAgentString("Mozilla/5.0 (Linux; Android 4.4.2; ASUS_T00J Build/KVT49L) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.78 Mobile");
        wv_paypalView.setWebViewClient(
                new SSLTolerentWebViewClient()
        );
wv_paypalView.loadUrl(PaypalURl);

private class SSLTolerentWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }

        @Override
        public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
            handler.proceed(); // Ignore SSL certificate errors
        }

    }