条纹 - 定期付款中包含的附加发票项目

我在订阅时添加发票项目时遇到问题,目前正在敲打我的头.

我在条纹上创建了一个发票项目,我希望发票项目包含在定期付款中

这是我的代码,它在第一张发票上添加了发票项目,但在下一张发票上没有.

$new_customer = Stripe_Customer::create(array(
    'card' => $card,
    'email' => $email,)
);
Stripe_InvoiceItem::create(array(
    'customer' => $new_customer['id'],
    'amount' => $additiona_charges,
    'currency' => 'gbp',
    'description' => 'Addtional Cities'
));
$new_customer->updateSubscription(array('plan' => $selected_plan, 'prorate' => true));

在我目前的设置.我根据订阅时的客户选择收取额外的自定义费用,这样我需要在定期付款时添加额外费用.

它是这样的

计划

1 Cookie - 99GBP  / Per month
2 Cookies - 199GBP / Per month
3 Cookies - 300GBP / Per month

附加费用 - 发票项目

-With Candle - +20GBP // must be included on recurring payment.
-With Icecream - +26GBP // must be included on recurring payment.
-With Cheese - +28GBP // must be included on recurring payment.
-With Ketchup - +30 //  must be included on recurring payment.
-With Poison (for your X) -  +50 //  must be included on recurring payment.

我希望有人可以提供帮助.非常感谢

干杯肯恩