func application(_ app: UIApplication, open url: URL, options: 
	[UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool
{
let arrURL:Array = url.absoluteString.components(separatedBy: "?")
let arrQuery:Array = arrURL[1].components(separatedBy: "=")
if(url.scheme == "refiller" && arrQuery[0] == "action")
{
	switch (arrQuery[1])
	{
		case "refillTryAgain":
		//Open the Error View Controller, they entered an invalid Rx Number
		case "cancel":
		//Open the Error View Controller, customer chose to cancel their refill
		case "back":
		//Open the Error View Controller, customer chose to back out of the refill
		case "close":
		//Open the Success View Controller, their Rx is on its way
		case "fillAnother":
		//Open the Refill View Controller, they want to refill another Rx
		default:
		//Open the Error View Controller, something bad happened during checkout
	}
	return true
}
else {return false}
}

@Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
	Uri appCallbackURI = Uri.parse(url);
	if (appCallbackURI != null && appCallbackURI.getScheme().equalsIgnoreCase("refiller"))
	{
		String action = appCallbackURI.getQueryParameter("action");
		switch(action)
		{
			case action.equalsIgnoreCase("refillTryAgain"):
				//Open the Error Activity, they entered an invalid Rx Number
			case action.equalsIgnoreCase("cancel"):
				//Open the Error Activity, customer chose to cancel their refill
			case action.equalsIgnoreCase("back"):
				//Open the Error Activity, customer chose to back out their refill
			case action.equalsIgnoreCase("close"):
				//Open the Success Activity, their Rx is on its way
			case action.equalsIgnoreCase("fillAnother"):
				//Open the Refill Activity, they want to refill another Rx
			default:
				//Open the Error Activity, something bad happened during checkout
		}
	}
}

@Override
public void onBackPressed()
{
	if (webview.getVisibility() == View.VISIBLE)
	{
		if (webview.canGoBack())
		{
			//Java script call to dismiss the Native calendar Control
			webview.loadUrl("javascript:dismissCalendar();");
			//Java script call to handle page navigations
			webview.loadUrl("javascript:nativeBackBtnClicked();");
		}
		else 
		{
			Intent intent = new Intent(CustomWebView.this, MainActivity.class);
			CustomWebView.this.startActivity(intent);
			finish();
		}
	}
}
}

//Route in your app.js file, for the callback action we passed of "rx", the query string value 
will be the value you passed when creating the checkout for 
"appCallbackAction" app.get('/callback',function(req,res)

{	
	var rx = (req.query.rx) ? req.query.rx : "";
	
	res.render("pages/callback",{title:rx,rx:rx});
});

//We use then use EJS to render content for the appropriate callback action value on callback.ejs 
page (you can use any view rendering engine)

switch (rx) {
	case 'refillTryAgain' :
    	Warning! Invalid Rx Number.
		Try Again?
    break;
	case 'cancel' :
    	Warning! You have cancelled the refill.
    	Try Again?
    break;
	case 'back' : 
		Warning! You have backed out of the refill.
        Try Again?
    break;
	case 'close' : 
		Success! The pharmacist has begun to process your refill.
		Want a status Update?
    break;
	case 'fillAnother' :
    	//Send them to refill homepage to refill another
    break;
}
}