title: Website Paypal Connection with Php
body: <p>Im trying to connect my website with paypal and i have the index page where i am getting the order price,
  the order name and then i refer them to the process.php using get for processing.Howevever,on running the process.php file i am getting this error</p>
  
  <pre><code>Error : Security header is not valid
  Array
  (
      [TIMESTAMP] =&gt; 2014%2d10%2d07T17%3a22%3a00Z
      [CORRELATIONID] =&gt; 37359d983e7a
      [ACK] =&gt; Failure
      [VERSION] =&gt; 109%2e0
      [BUILD] =&gt; 13243702
      [L_ERRORCODE0] =&gt; 10002
      [L_SHORTMESSAGE0] =&gt; Security%20error
      [L_LONGMESSAGE0] =&gt; Security%20header%20is%20not%20valid
      [L_SEVERITYCODE0] =&gt; Error
  )
  </code></pre>
  
  <p>How can i solve this error.Please Assist</p>