Securely generates new PATs. Useful for a service that wants to issue PATs to users.

PatGenerator.cs

using System;
using System.Security.Cryptography;

public static class SecurityUtilities
{
    static void Main(string[] args)
    {
        Console.WriteLine(GeneratePat());
        Console.WriteLine(GeneratePat());
        Console.WriteLine(GeneratePat());
    }

    public static string GeneratePat()
    {
        const int bitStrength = 256;
        Span<byte> randomData = stackalloc byte[bitStrength / 8];
        RandomNumberGenerator.Fill(randomData);
        string pat = Convert.ToBase64String(randomData).Replace('+', '-').Replace('/', '_').TrimEnd('=');
        return pat;
    }
}