Paypal 从AdaptivePayments获取交易编号

这是对我之前问题的更新。鉴于这个问题的整个问题已经改变，我觉得有必要提出一个更准确、更详细的问题。这是我的密码：

支付 调用这些函数

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我的问题是-如何检索在

SetupPayment（）

&中创建的、在

ExecutePayment（）中执行的付款的交易编号/ID？我在Adaptive Payments API中看到的唯一一点是，交易编号在IPN消息中……但是否只有通过IPN才能真正获取交易编号？
执行支付后，请致电PaymentDetails。响应应该有事务ID（
paymentInfoList.paymentInfo（0）.transactionId
，用于接收方的事务ID，或者
paymentInfoList.paymentInfo（n）.senderTransactionId
，用于发送方的事务ID）。
这似乎就是我要找的。但由于某些原因，paymentDetailsResponse.paymentInfoList为空。是否有某种方式我需要特别要求填充数据？如果paymentInfoList为空，则可能表明买家从未在PayPal上完成付款。
public PayResponse SetupPayment(string receiverEmail, decimal amountToPay)
{
    ReceiverList receiverList = new ReceiverList { receiver = new List<Receiver>() };
    Receiver receiver = new Receiver(amountToPay) { email = receiverEmail };
    receiverList.receiver.Add(receiver);

    RequestEnvelope requestEnvelope = new RequestEnvelope("en_US");
    const string actionType = "CREATE";
    const string returnUrl = "https://devtools-paypal.com/guide/ap_implicit_payment/dotnet?success=true";
    const string cancelUrl = "https://devtools-paypal.com/guide/ap_implicit_payment/dotnet?cancel=true";
    const string currencyCode = "USD";

    PayRequest payRequest = new PayRequest(
        requestEnvelope,
        actionType,
        cancelUrl,
        currencyCode,
        receiverList,
        returnUrl)
    {
        senderEmail = ConfigurationManager.AppSettings["PayPalSenderEmail"]
    };

    AdaptivePaymentsService adaptivePaymentService = new AdaptivePaymentsService(_payPalConfig);
    PayResponse payResponse = adaptivePaymentService.Pay(payRequest);

    return payResponse;
}

public ExecutePaymentResponse ExecutePayment(string payKey)
{
    RequestEnvelope requestEnvelope = new RequestEnvelope("en_US");
    ExecutePaymentRequest executePaymentRequest = new ExecutePaymentRequest(requestEnvelope, payKey);
    AdaptivePaymentsService adaptivePaymentsService = new AdaptivePaymentsService(_payPalConfig);
    ExecutePaymentResponse executePaymentResponse = adaptivePaymentsService.ExecutePayment(executePaymentRequest);
    return executePaymentResponse;
}

PayResponse payResponse = payPalAdapter.SetupPayment(payPalUserEmail, commissionAmount);

if (payResponse.responseEnvelope.ack.ToString() == "SUCCESS")
{
    ExecutePaymentResponse executePaymentResponse = payPalAdapter.ExecutePayment(payResponse.payKey);
}