Adobe IO event calls not having payload data in request attribute in dispatcher

I'm trying to invoke a servlet when a build gets triggered from Adobe IO. I have created the event and the servlet is working fine in my local, when I trigger the request through postman. When Adobe IO triggers request, the request attribute  containing the payload data is coming null in my servlet which makes my servlet to fail. 

Note: I have given dispatcherURL/servletPath in WebHookUrl

Please share your inputs on the same