Integration with Leviton Wi-Fi devices is done at the account level, so there are no individual Device handlers. So the first thing you have to do is add the switch to your Leviton Wi-Fi account.
After that, use the + in the upper right corner of the main screen, then choose add a device.
After that, you can add by brand, and choose Leviton.
From there, choose Switch/Dimmer, then choose “Leviton Wi-Fi devices“ and then sign in with your Leviton account and your two accounts will be linked.
After that, all of your eligible Leviton Wi-Fi devices will show up in the IDE with a “placeholder“ DTH. Do not change that or the integration won’t work.
FAQ: Why does the IDE list “placeholder” for my device? Can I change that?