title: Posting Message to a Slack Channel using Postman
body: <p>I have created a personal account and created a channel on it. I want to do a POC where I want to post messages on my channel using POSTMAN. How should I do that? If anyone has done this using java code or a POC, Could you help me with the requisite and prerequisite?</p>
  
  <p>I am looking for HTTP methods, headers or all information. </p>