Features:

• Allowlist only mode (You have to be allowlisted, no password prompt)
• Password only mode (You have to know the password, no allowlist check)
• Allowlist and password mode (You have to be allowlisted and know the password)
• Clever mode (If you're allowlisted, you're not asked for a password. If you're not allowlisted, you're asked for one.)
• Easy to configure (password, attempts, Discord link shown on refused connection)
• Shows user all of his/her identifiers and a link upon refused connection to easily copy/paste identifiers.

Installation:

• Clone or download via github.
• Put it into resources.
• Add start pun_allowlist to your server.cfg file.
• Start the server. If it's already up just type refresh followed by start pun_allowlist into the server or client console.

ConnectQueue compatibility:

• Download and install the experimental branch instead of the main branch.
• Make sure you have the latest version of ConnectQueue installed.
• Go to connectqueue/shared/sh_queue.lua, line 653, look for this part of the code:

AddEventHandler("playerConnecting", playerConnect)

• Make it look like this:

AddEventHandler("pun_allowlist:playerConnecting", playerConnect)

• Now in line 444, look for this part of the code:

local function playerConnect(name, setKickReason, deferrals)
	local src = source

• Make it look like this:

local function playerConnect(player, name, setKickReason, deferrals)
	local src = player

Credits:

• enferList | Some bits of code but mostly the logic and idea on how I wanted this script to work in the end.
• Frazzle | Basically 100% of the code that makes the passwords work.