title: How to VOID an Authorized transaction through paypal form
body: <p>I am using paypal form to authorize payment on my website using its hidden variable:</p>
  
  <pre><code>&lt;input type="hidden" name="paymentaction" value="authorization" &gt;
  </code></pre>
  
  <p>How can I void this authorized transactions via my website (in case if user cancel his order).</p>
  
  <p>Thanks</p>