Yii 在PayPal中快速签出时出现错误10525

我有以下代码（使用Yii-PHP框架）：

用户被重定向到Paypal，但当他们使用沙箱帐户登录并尝试付款时，我从Paypal收到一个10525错误：

无法处理此事务。收费金额为零

---

结帐失败了。是否有一个属性我没有设置，而进程失败了？

我发现了问题。我忘记包含事务所需的另一个对象：

$itemDetails = new PaymentDetailsItemType();
$itemDetails->Name = $subscription->description;
$itemDetails->Amount = new BasicAmountType('USD', $subscription->price);
$itemDetails->Quantity = 1;
$itemDetails->ItemCategory = 'Digital';

$PaymentDetails->PaymentDetailsItem[0] = $itemDetails;

这条线

$PaymentDetails->ShippingTotal = $PaymentDetails->HandlingTotal
  = $PaymentDetails->InsuranceTotal = $PaymentDetails->TaxTotal
  = new BasicAmountType('USD', 0);

也应该改为

$PaymentDetails->OrderTotal = $PaymentDetails->ItemTotal =
  new BasicAmountType('USD', $subscription->price);

$PaymentDetails->OrderTotal = $PaymentDetails->ItemTotal =
  new BasicAmountType('USD', $subscription->price);