When you perform a send, the WNS always send you a response and each of them contains a code and customs header fields.
You can check this link for the response list.
NOTE: Some custom header responses need the X-WNS-RequestForStatus field in request header.
However, the send methods return an array with two fields:
1. “WNS” => array with response header
2. “response” => the response code
Checking the response code, you can choose the script flow and the service behavior.
So you can use it in this way
$response = $Notifier->Send($cha,WindowsNotification\TemplateToast::ToastText01("Hello!!!!"));