paypal试用定期付款尚未开始

我已经创建了一个试用期为1个月的贝宝定期付款。我正在测试我的沙盒帐户。

完成1次付款后,我可以在我的沙盒商户帐户中看到已创建定期付款。但它显示:“循环周期剩余1个月”,我收到了0美元。我的意思是循环付款已经开始,但我没有收到钱。

这是贝宝的错还是我的代码有问题?

我正在使用CMS(社交网络)。Paypal已经在这里集成了。所以我只是在修改它。这是我发送的参数。

// This Portion to display the payment summery :
 $params['driverSpecificParams']['PayPal'] = array(
    'ITEMCATEGORY'=> 'Digital',
    'AMT' => $params['price'],
    'NAME' => $package->title,
    'DESC' => $desc,
    'ITEMS' => array(
      array(
        'NAME' => $package->title,
        'AMT' => $params['price'],
       'QTY' => 1,
      ),
    ),
    'BILLINGTYPE' => 'RecurringPayments',
    'BILLINGAGREEMENTDESCRIPTION' => $desc,
  );

 // And this portion for payment subscription.
    $rpData = array(
        'TOKEN' => $params['token'], 
        'PROFILEREFERENCE' => $order->order_id,
        'PROFILESTARTDATE' => $data['TIMESTAMP'],
        'DESC' => $desc, //Item Description
        'BILLINGPERIOD' => ucfirst($package->recurrence_type), 
        'BILLINGFREQUENCY' => $package->recurrence,
        'INITAMT' => 0 ,
        'TRIALBILLINGPERIOD' => ucfirst($package->recurrence_type),
        'TRIALBILLINGFREQUENCY' => $package->recurrence,
        'TRIALTOTALBILLINGCYCLES' => 1,
        'TRIALAMT' => $_SESSION["price"],
        'AMT' => $package->price,
        'CURRENCYCODE' => $this->getGateway()->getCurrency(),
      );

我还想知道在试用期的几个月内设置0美元是否有效?

贝宝显示如下: [1]: https://i.stack.imgur.com/mSxk1.png