laravel autoload自定义文件夹未加载

Question

我曾尝试在app/中使用自定义文件夹存储帮助程序，例外，存储库等等。我尝试按照测试...

目录结构

app
  -iw
     -Billing
         -BillingInterface.php
         -StripeBilling.php
     -Exceptions
     -Repositories
     -macros.php

我甚至在composer.json文件中添加了以下内容并运行了命令composer dump

"psr-0": {
    "iw" : "app/"
}

为测试目的而创建的类......

// app/iw/BillingInterface.php (location)

<?php namespace iw\Billing;

interface BillingInterface {}

和

// app/iw/StripeBilling.php (location)

<?php namespace iw\Billing;

class StripeBilling {

    public function bill()
    {
        dd('billing');
    }

}

当我尝试跟随...

(new iw\Billing\StripeBilling)->bill();

我得到Class 'iw\Billing\StripeBilling' not found

请帮我解决这个问题。感谢