title: How to get the token from a request done with Paypal rest-api-sdk-php library
body: <p>I am using <a href="https://github.com/paypal/rest-api-sdk-php" rel="nofollow">rest-api-sdk-php</a> to make requests to Paypal. When I execute a request it looks something like this: </p>
  
  <pre><code>https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&amp;token=EC-74C74934GB935960F"
  </code></pre>
  
  <p>I need to retrieve the token that is used to sign the request. </p>
  
  <p><strong>Is there a method in the library to get this token?</strong></p>