public class Startup
{
    // safe config name
    public const string ApiKeyName = "access_key";

    // suspicious placeholder
    private string tokenExample = "your_token_here_1234567890abcdef";

    // real secret
    private string stripeKey = "sk_live_1234567890abcdef";

    // connection string
    private string db = "Server=prod;Database=Main;User Id=admin;Password=SuperSecret;";
}