Take inbound requests from Mailgun and create or update threads in Intercom.io based on those requests.
Get the app and do this:
gem install bundler
bundle install
To install into Heroku, do this:
heroku create appname
heroku config:add INTERCOM_APP_ID=app-id
heroku config:add INTERCOM_APP_KEY=app-key
git push heroku master
Set up your domain on Mailgun (along with the MX records Mailgun needs) and create a route that looks like this (replace xyz123 with the app id from intercom.io.
Filter Expression: match_recipient("support@your-app.com")
Actions: forward("http://your-app.heroku.com/xyz123/messages")