I have tried to send getresponse newsletter through API. Its not working as expected. i have followed the https://github.com/GetResponse/DevZone/tree/master/API#send_newsletter
Here the code http://pastebin.com/tWWKgpF5
I'm not so sure which is wrong.
Finally Got it. It may be useful. YOu can find lots of example https://github.com/robertstaddon/GetResponse-PHP-Wrapper/blob/master/PHPwrapper/examples.php