The slack app is a simple Python web scraper using Requests and BeautifulSoup.
To set this up for your workspace, paste the incoming webhook URL in the config file. The first run will fetch all visible checkins and 'bookmark' the latest so that future runs only fetch new checkins.
Here's what the output looks like. We've configured the scraper to run every 10 minutes and seem to get lots of notifications on Sundays :)