PayPal Webhook事件未在沙盒模式下触发

我正在使用PayPal Rest API，更具体的PayPal .Net SDK用于我的项目，我非常喜欢它 .

我的问题是，到目前为止，我无法从PayPal收到任何webhook通知 .

注意：webhook模拟器然而 does 工作，我的处理程序从PayPal正确接收json帖子 .

这些是我采取的步骤：

• 成功创建新发票（使用我的paypal应用程序中的沙箱凭据）后，我将其发送到测试买家帐户 .

• 我打开通知中的网址查看发票，我使用买方测试帐户付款 .

• 协调人和买家都会收到通知已成功支付发票的通知 .

• 我的服务器什么都没发生 . 我的侦听器 endpoints 没有收到任何webhook事件请求 .

我在应用程序的沙盒配置中有一个活动的webhook事件监听器，跟踪所有可能的事件 .

可能是PayPal没有发生任何事件的原因是什么？

我还不想切换到IPN，并且从搜索结果中定期迭代发票列表也不是一种有效的替代方案 .

更新：

由于沙盒webhook事件服务器已启动并再次运行，因此我使用以下代码（c＃controller action）使其工作 . 注意从webhook模拟器发射的json体结构与支付发票后发送的结构不同 . 因此，我相应地从PayPal SDK扩展了WebHookEvt对象 .

/// <summary>
    /// PayPal Webhook handler
    /// </summary>
    /// <param name="evt"></param>
    /// <returns></returns>
    [HttpPost]
    public ActionResult EventHandler(WebhookEvent evt) { // [System.Web.Http.FromBody]

        string json = null;
        Capture capture = null;
        InvoiceObject invoiceObject = null;
        InvoiceExt invoice = null;
        WebHookEventCapture captureEvent = null;
        WebHookEventInvoice invoiceEvent = null;

        if (evt == null) {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        } else {
            this.logger.Debug(string.Format("***** Webhook event type [{0}] received from PayPal *****", evt.event_type));
            logger.Debug(string.Format("Event id: {0}", evt.id));
            logger.Debug(string.Format("Event create time: {0}", evt.create_time));
            logger.Debug(string.Format("Event type: {0}", evt.event_type));
            logger.Debug(string.Format("Event resource: {0}", evt.resource));
            logger.Debug(string.Format("Event resource type: {0}", evt.resource_type));
            logger.Debug(string.Format("Event summary: {0}", evt.summary));

            using (Stream req = Request.InputStream) {
                req.Seek(0, System.IO.SeekOrigin.Begin);
                using (StreamReader sr = new StreamReader(req)) {
                    json = sr.ReadToEnd();
                }
            }

            logger.Debug(string.Format("WebHook request json form PayPal: ***{0}***", json));

            // Validate webhook event
            bool isValid = WebhookEvent.ValidateReceivedEvent(new PayPalPaymentProvider(IPN_SANDBOX_MODE).Context, Request.Headers, json, WEBHOOK_ID_INVOICE_PAID);
            logger.Debug(string.Format("Validating webhook event... Is valid = {0}", isValid ? "TRUE" : "FALSE"));                

            try {
                if ("capture".Equals(evt.resource_type)) {
                    captureEvent = JsonConvert.DeserializeObject<WebHookEventCapture>(json);
                    capture = captureEvent.resource;
                } else if ("invoices".Equals(evt.resource_type)) {
                    invoiceEvent = JsonConvert.DeserializeObject<WebHookEventInvoice>(json);
                    invoiceObject = invoiceEvent.resource;
                    invoice = invoiceObject.invoice;
                }

                //if (capture != null) {
                //    logger.Debug(string.Format("Capture amount: {0}", capture.amount));
                //    logger.Debug(string.Format("Capture create time: {0}", capture.create_time));
                //    logger.Debug(string.Format("Capture id: {0}", capture.id));
                //    logger.Debug(string.Format("Capture is final: {0}", capture.is_final_capture.HasValue ? capture.is_final_capture : false));
                //    logger.Debug(string.Format("Capture parent payment: {0}", capture.parent_payment));
                //    logger.Debug(string.Format("Capture state: {0}", capture.state));
                //    logger.Debug(string.Format("Capture transaction fee: {0}", capture.transaction_fee));
                //    logger.Debug(string.Format("Capture update time: {0}", capture.update_time));
                //}

                if (isValid && invoice != null) {
                    logger.Debug(string.Format("Invoice [{0}]", invoice));
                    logger.Debug(string.Format("Invoice id: [{0}]", invoice.id));
                    logger.Debug(string.Format("Invoice merchant memo: [{0}]", invoice.merchant_memo));
                    logger.Debug(string.Format("Invoice date: [{0}]", invoice.invoice_date));
                    logger.Debug(string.Format("Invoice status: [{0}]", invoice.status));
                    logger.Debug(string.Format("Invoice total amount: [{0}]", invoice.total_amount != null ? invoice.total_amount.currency + invoice.total_amount.value : "??"));
                    if (invoice.billingInfo != null) { // billing_info
                        foreach (var billingInfo in invoice.billingInfo) {
                            logger.Debug(string.Format("Invoice billing info address: {0}", billingInfo.address ?? new InvoiceAddress()));
                            logger.Debug(string.Format("Invoice billing info business name: {0}", billingInfo.business_name ?? "??"));
                            logger.Debug(string.Format("Invoice billing info email: {0}", billingInfo.email ?? "??"));
                            logger.Debug(string.Format("Invoice billing info first name: {0}", billingInfo.first_name ?? "??"));
                            logger.Debug(string.Format("Invoice billing info last name: {0}", billingInfo.last_name ?? "??"));
                            logger.Debug(string.Format("Invoice billing info language: {0}", billingInfo.language ?? "??"));
                            logger.Debug(string.Format("Invoice billing info notification channel: {0}", billingInfo.notification_channel ?? "??"));
                            logger.Debug(string.Format("Invoice billing info phone: {0}", billingInfo.phone ?? new Phone()));
                        }
                    }

                    // Update clientproductpayment
                    SubscriptionRepository db = new SubscriptionRepository();
                    var subscription = db.Context.ClientProductPayments.Where(
                                q => invoice.id.Equals(q.TransactionId)).FirstOrDefault();
                    if (subscription != null) {
                        logger.Debug(string.Format("Subscription (ClientProductPayment) with transaction_id = [{0}] found", invoice.id));

                        // Update subscription
                        db.RegisterPayment(subscription, invoice.id);

                        logger.Debug(string.Format(
                            "Subscription (ClientProductPayment) with id = [{0}] updated successfully with transaction id = [{1}]",
                                subscription.Id, invoice.id));

                    } else {
                        logger.Warn(string.Format("Subscription (ClientProductPayment) with transaction_id = [{0}] not found", invoice.id));
                    }

                }

            }
            catch (Exception e) {
                logger.Error(e.Message, e);
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

        }
        logger.Debug("Sending Http status code 200 response...");
        return new HttpStatusCodeResult(HttpStatusCode.OK);            
    }

扩展WebHookEvt

using Newtonsoft.Json;
using PayPal.Api;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PaymentManager.Provider {
    public class WebHookEventCapture : WebhookEvent {

        [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "resource")]
        public new Capture resource { get; set; }

    }

    public class WebHookEventInvoice : WebhookEvent {

        [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "resource")]
        public new InvoiceObject resource { get; set; }

    }

    public class InvoiceObject {

        [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "invoice")]
        public InvoiceExt invoice { get; set; }

    }

    public class InvoiceExt : Invoice {

        [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "billingInfo")]
        public List<BillingInfo> billingInfo { get; set; }

    }

}