title: PayPal Mobile SDK authorization issue
body: <p>I am having an issue with the integration of the PayPal mobile SDK for iOS.</p>
  
  <p>I’ve downloaded the new and latest api. Using the integrated sample for first time lookup.</p>
  
  <p>Set the correct client IDs (they are correct, triple checked it).</p>
  
  <p>Mock mode - works without any issues.</p>
  
  <p>As soon as i switch to Sandbox i start getting these:</p>
  
  <pre><code>2014-07-08 19:21:05.477 PayPal-iOS-SDK-Sample-App[24241:60b] PayPal iOS SDK version: PayPal iOS SDK 2.1.4
  2014-07-08 19:21:06.579 PayPal-iOS-SDK-Sample-App[24241:60b] Environment: mock. Accept credit cards? 0
  2014-07-08 19:21:07.315 PayPal-iOS-SDK-Sample-App[24241:60b] Environment: mock. Accept credit cards? 1
  2014-07-08 19:21:07.766 PayPal-iOS-SDK-Sample-App[24241:60b] Environment: sandbox. Accept credit cards? 1
  2014-07-08 19:21:09.239 PayPal-iOS-SDK-Sample-App[24241:60b] PayPal SDK: Request has failed with error: INTERNAL_SERVICE_ERROR - System error. Please try again later. (500) | PayPal Debug-ID: b4bbc51d2a20d [sandbox, PayPal iOS SDK 2.1.4]
  2014-07-08 19:21:10.241 PayPal-iOS-SDK-Sample-App[24241:60b] PayPal SDK: Request has failed with error: INTERNAL_SERVICE_ERROR - System error. Please try again later. (500) | PayPal Debug-ID: a5f9e9e417d35 [sandbox, PayPal iOS SDK 2.1.4]
  2014-07-08 19:21:14.657 PayPal-iOS-SDK-Sample-App[24241:60b] PayPal Future Payment Authorization Canceled
  2014-07-08 19:21:15.634 PayPal-iOS-SDK-Sample-App[24241:60b] PayPal SDK: Request has failed with error: INTERNAL_SERVICE_ERROR - System error. Please try again later. (500) | PayPal Debug-ID: d1242faa1500d [sandbox, PayPal iOS SDK 2.1.4]
  </code></pre>
  
  <p>Apart from this a second question :)</p>
  
  <p>The way i understand the authorization of payments is that - we don't authorize a specific payment (say the Client wants to purchase 1 ball for $4.50 - we don't authorize this specific payment - but get a generic token instead with which we can complete any future payment)?</p>
  
  <p>Thanks again!</p>