Generate Slack Security Token
https://api.slack.com/web#auth
Post message to slack
https://gist.github.com/alexstone/9319715
Example of PHP Slack
https://github.com/Frlnc/php-slack
Good oauth video
Note: don’t bother with Guzzel. Just use normal curl calls
Auto inviation code in Node.js
https://github.com/outsideris/slack-invite-automation
Auto invitation code in PHP
https://levels.io/slack-typeform-auto-invite-sign-ups/
Getting started with slack bot
http://www.sitepoint.com/getting-started-slack-bots/
Putting Hubot on Slack
http://blog.pandorabots.com/putting-your-bot-on-slack/
A Slack Bot Without A Server
https://docs.apitools.com/blog/2015/01/15/a-slack-bot-without-a-server.html
To get a list of channel id
Goto slack channel.id api page. Click on the tester tab. Test call the api interface. Get list from result window.