If you want to see the source code, unzip the jar file.
Each Discord account can only be linked to one account, which can help increase Discord members, prevent bots, and legitimate users.
Install the plugin in the plugins folder, start the server, then go to config.yml and paste your Discord token, and then restart once more. Make sure you have invited the bot to your server.
How to create a discord bot:
https://discord.com/developers/applications
Support Us:
https://discord.gg/Kv6WAhzXXM