The plugin is for communication between BungeeCord and Spigot servers.
You also need to install ChronAPI and ChronGuard on BungeeCord or Velocity, and then copy the token from ChronGuard’s token.yml into the backend server’s config.yml as a list:
TOKENS:
- 'token'
The TOKEN_KEY is just a single string, and it must be the same on every server!
Discord contact:
https://discord.gg/CpVsgbBhkz