Heroku has a read-only filesystem, which means we won’t be able to write any logfiles. You are still able to use the official Ruby Library, but synchronously, without cron job support.

Another option people have used in the past is https://github.com/vbrendel/delayed_km. This isn’t a gem officially supported by us, but it has been successfully used on Heroku.

Is anything on this page unclear? Suggest edits on Github!