Slack
# Send to channelcurl -H "Authorization: Bearer $SLACK_TOKEN" -d "text=Hi I am a bot that can post messages to any public channel." -d "channel=channelname" https://slack.com/api/chat.postMessage
# Send DM (channel=userID)curl -H "Authorization: Bearer $SLACK_TOKEN" -d "text=Hi I am a bot that can post messages to any public channel." -d "channel=U03XXXTWCF5X" https://slack.com/api/chat.postMessage