This plugin makes it easy to flush OPcache and FastCGI cache (if enabled) from your Ploi servers & sites.
Download the plugin from your WordPress installation, on the plugin page.
You can either do this by searching in the WordPress plugin page, or uploading the ZIP downloaded from this repository.
After installation, you will have to generate a API key in Ploi:
https://ploi.io/profile/api-keys and enter this in the plugin settings. Then you'll be able to select the proper server & site that needs to be attached to your WordPress installation.