This plugin creates a discord bot which would be hosted on the server itself which lets you use the following commands through Discord's slash commands:

• whitelist add {player}
• whitelist remove {player}

This is the config file (on display to view what customisability the plugin offers)

# Discord Bot Token - Get this from https://discord.com/developers/applications
token: YOUR_DISCORD_BOT_TOKEN_HERE
allowedDiscordRoles: []

# Command templates executed by the server console.
# Use {player} as a placeholder for the Minecraft username.
whitelistAddCommand: "whitelist add {player}"
whitelistRemoveCommand: "whitelist remove {player}"

Discord reply messages.

Placeholders:

- {player} / {username}: the Minecraft username

messages: noPermission: "You don't have permission to use this command!" errorNoSubcommand: "Error: No subcommand provided!" errorNoUsername: "Error: Username option not provided!" errorPluginNotInitialized: "Error: Plugin not initialized!" invalidUsername: "Error: Invalid username! Minecraft usernames must be 3-16 characters (letters, numbers, underscore only)." successAdded: "Added {player} to the whitelist!" successRemoved: "Removed {player} from the whitelist!"