PayPal付款专业直接付款检查是否成功

嘿伙计们希望你能帮助我。

我似乎找不到任何适当的参考或文档来说明他们的直接支付 api 和变量，所以我现在在这里问。

我是第一次直接付款，根据他们的集成指南，付款状态应该是"成功"，但这是我得到的响应（即我print_r($doDirectPaymentResponse);变量来自哪里

$doDirectPaymentResponse = $paypalService->DoDirectPayment($doDirectPaymentReq,$credential_object);)

DoDirectPaymentResponseType Object
(
    [Amount] => BasicAmountType Object
        (
            [currencyID] => USD
            [value] => 12.00
        )
    [AVSCode] => X
    [CVV2Code] => M
    [TransactionID] => 9H515811FE178263Y
    [PendingReason] => 
    [PaymentStatus] => 
    [FMFDetails] => 
    [ThreeDSecureResponse] => 
    [PaymentAdviceCode] => 
    [Timestamp] => 2013-02-01T15:56:31Z
    [Ack] => Success
    [CorrelationID] => a0a240936bf65
    [Errors] => 
    [Version] => 94.0
    [Build] => 5060305
)

另外，ACK场到底说明了什么？