<script type="text/javascript" charset="utf-8">
  $(document).ready(function() {
 
    // Identify some vars...
    var apiFilePath = 'http//path/to/api/file.php';
    var sid = 123456;
    var token = 'ABCDE';
    var email = 'example@example.com'; 
    var firstName = 'Fred'; 
    var lastName = 'Flinstone'; 
 
    // AJAX call
    $.ajax({  
      url: apiFilePath, // Path to the PHP file
      async: true,
      cache : false, // No caching in IE
      data: {
        sid: sid, 
        token: token,
        email : email, 
        firstName: firstName, 
        lastName: lastName 
      },
      success: function(results){  
        // Do something with the returned results of the AJAX call
      },
      error: function(){
        alert('Could not connect!');
      }
    }); 
  });
</script>

$iSurveyID = $_GET["sid"];
$token = $_GET["token"];
$email = $_GET["email"];
$LastNameAPI = $_GET["firstName"];
$FirstNameAPI = $_GET["lastName"];