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POServer unavailable error on calling Payment.Create in PayPal sdk
 

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    <p>I downloaded the Paypal SDK for C# and am trying to create a basic payment in my asp.net mvc app. I'm running the exact code mentioned in the paypal dev site, <a href="https://developer.paypal.com/webapps/developer/docs/api/#create-a-payment" rel="noreferrer">https://developer.paypal.com/webapps/developer/docs/api/#create-a-payment</a> but am getting an error (stack trace below). I'm able to get an access token so I'm assuming the app is able to communicate with the endpoint, but not sure why it complains in the Payment.create method. This is the first time I'm using asp.net mvc so am a little confused about what I could be doing wrong and would really appreciate any help :)</p> <p>My Web.config file has this section:</p> <pre><code> &lt;paypal&gt; &lt;settings&gt; &lt;add name="endpoint" value="https://api.sandbox.paypal.com" /&gt; &lt;add name="connectionTimeout" value="360000" /&gt; &lt;add name="requestRetries" value="1" /&gt; &lt;add name="ClientID" value="xyz" /&gt; &lt;add name="ClientSecret" value="abc" /&gt; &lt;/settings&gt; &lt;/paypal&gt; </code></pre> <p>Stack trace:</p> <pre><code>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:\Users\Ishan\Source\Repos\requext.com\Requext\Controllers\EventController.cs:line 169 at Requext.Controllers.EventController.Test() in c:\Users\Ishan\Source\Repos\requext.com\Requext\Controllers\EventController.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.&lt;&gt;c__DisplayClass42.&lt;BeginInvokeSynchronousActionMethod&gt;b__41() at System.Web.Mvc.Async.AsyncResultWrapper.&lt;&gt;c__DisplayClass8`1.&lt;BeginSynchronous&gt;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.&lt;&gt;c__DisplayClass37.&lt;&gt;c__DisplayClass39.&lt;BeginInvokeActionMethodWithFilters&gt;b__33() at System.Web.Mvc.Async.AsyncControllerActionInvoker.&lt;&gt;c__DisplayClass4f.&lt;InvokeActionMethodFilterAsynchronously&gt;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: </code></pre>
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    1. COI am having the same problem. I'm starting to think it's a problem with the .Net library they provide. The code doesn't look like production quality code. I can make curl calls with no problem. I may Fork my own copy so I can debug it.
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    2. COI've had less than stellar experience integrating PayPal direct payment in our c# MVC3 application a couple years back due to their lack of documentation and an outdated c# SDK. Ultimately, I had success manually creating a `HttpWebRequest` that POSTs an HTML form with the appropriate form values in the content. I'd be happy to post the details if you're interested. However, uninstalling the nuget packages (RestApiSDK and PayPalCoreSDK), restarting Visual Studio and re-installing the nuget packages seemed to resolve this error (from this [answer](http://stackoverflow.com/a/19504323/143008)).
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    3. COThanks Agile and HOCA. I gave up on it and used a workaround since it looks like the SDK code is buggy.
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