course-server/config/invoice.php

<?php

return [
    'user_model' => GuoJiangClub\Component\User\Models\User::class,

    'order_model' => GuoJiangClub\Component\Order\Models\Order::class,

    'content' => ['商品明细', '办公用品', '电脑配件', '耗材'],

    'type' => ['普通发票', '电子发票', '增值税发票'],
];