调用付款时出现服务器不可用错误.在PayPal sdk 中创建

Question

我下载了适用于 C# 的 PayPal SDK，并尝试在我的 asp.net mvc 应用程序中创建基本付款。我正在运行PayPal开发站点中提到的确切代码，https://developer.paypal.com/webapps/developer/docs/api/#create-a-payment 但收到错误（下面的堆栈跟踪）。我能够获得访问令牌，因此我假设该应用程序能够与端点通信，但不确定为什么它在 Payment.create 方法中抱怨。这是我第一次使用 asp.net mvc，所以我对我可能做错了什么有点困惑，非常感谢任何帮助:)

我的 Web.config 文件有以下部分：

  <paypal>
    <settings>
      <add name="endpoint" value="https://api.sandbox.paypal.com" />
      <add name="connectionTimeout" value="360000" />
      <add name="requestRetries" value="1" />
      <add name="ClientID" value="xyz" />
      <add name="ClientSecret" value="abc" />
    </settings>
  </paypal>

堆栈跟踪：

PayPal.Exception.PayPalException was unhandled by user code   HResult=-2146233088   Message=Exception in HttpConnection Execute: Invalid HTTP response The remote server returned an error: (503) Server Unavailable.   Source=PayPalCoreSDK   StackTrace:
       at PayPal.PayPalResource.ConfigureAndExecute[T](Dictionary`2 config, IAPICallPreHandler apiCallPreHandler, HttpMethod httpMethod, String resourcePath)
       at PayPal.PayPalResource.ConfigureAndExecute[T](APIContext apiContext, HttpMethod httpMethod, String resource, String payload)
       at PayPal.Api.Payments.Payment.Create(APIContext apiContext)
       at PayPal.Api.Payments.Payment.Create(String accessToken)
       at Requext.Controllers.EventController.CreatePayment() in c:UsersIshanSourceReposrequext.comRequextControllersEventController.cs:line 169
       at Requext.Controllers.EventController.Test() in c:UsersIshanSourceReposrequext.comRequextControllersEventController.cs:line 95
       at lambda_method(Closure , ControllerBase , Object[] )
       at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
       at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
       at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.InvokeSynchronousActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41()
       at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult
_)
       at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End()
       at System.Web.Mvc.Async.AsyncResultWrapper.End[TResult](IAsyncResult asyncResult, Object tag)
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33()
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() InnerException: PayPal.Exception.ConnectionException
       HResult=-2146233088
       Message=Invalid HTTP response The remote server returned an error: (503) Server Unavailable.
       Source=PayPalCoreSDK
       Response=""
       StackTrace:
            at PayPal.HttpConnection.Execute(String payLoad, HttpWebRequest httpRequest)
       InnerException:

Answer 1

我和PayPal一起工作了很多，我发现最好的方法是只使用他们的"REST"api（注意"）。由于"不泄露"协议，我无法发布我所做的解决方案，但相信我，只需完成将 SDK 移动到垃圾箱并从他们的 POST API 和"返回 POST"API 开始。它更简单。