You may already know this, but the official Harmony/smartthings integration provided by Harmony is a custom groovy smart app and it will die when the groovy cloud goes away. Logitech support has already confirmed that they will not be making a new version. 
There is a very clever community-created Edge Driver substitute which you can use if you are still running a smartthings hub.
[EDGE DEVICE] Simple Harmony Bridge **Alpha Testing**
If you aren’t still running a smartthing/aeotec hub, The options are much more limited, and you might be better off with the Hubitat integration. But here’s a discussion thread on the alternatives: