https://corikachu.github.io/articles/python/python-slack-bot-slacker

https://www.slideshare.net/wan2land/php-slack-bot

https://chatbotslife.com/write-a-serverless-slack-chat-bot-using-aws-e2d2432c380e

https://api.slack.com/slash-commands

https://api.slack.com/tutorials/aws-lambda

https://api.slack.com/slack-apps

http://www.usefulparadigm.com/2016/04/06/creating-a-slack-bot-with-aws-lambda-and-api-gateway/