title: "DATA_RETRIEVAL" error when deployed on GAE
body: <p>I am using the new iOS SDK and it's associated REST API. Implementing the iOS framework was a charm but when trying to verify the payments using a Java/Google App Engine backend things are less than optimal. All of this is in testing on the sandbox environment.</p>
  
  <p>Right now the Credit Card payment verification is working (using the REST API SDK v0.5.2) when testing locally. However, when I deploy the application to the app engine the call to com.paypal.api.payments.Payment.get(accessToken, paymentId) fails and returns the following error:</p>
  
  <blockquote>
    <p>Response Code : 500 with response : {"name":"DATA_RETRIEVAL","message":"Error retrieving data","information_link":"<a href="https://developer.paypal.com/docs/api/#DATA_RETRIEVAL" rel="nofollow">https://developer.paypal.com/docs/api/#DATA_RETRIEVAL</a>","debug_id":"b42c7f5c2b97d"}</p>
  </blockquote>
  
  <p>A couple more debug ids in case they help: 04870b7c20522, 9cc4393ce08b1, 3d3eb3b9109e0.</p>
  
  <p>The information link only contains another error message.</p>
  
  <blockquote>
    <p>("Service Temporarily Unavailable - The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.")</p>
  </blockquote>
  
  <p>Does anyone have an idea why this fails on the App Engine? Any help would be appreciated.</p>