PaypalIpnConfig gives me a fatal error - cakephp

Question

I have this code in my C:\xampp\htdocs\wifidrivescanportal\app\Plugin\PaypalIpn\View\Helper\PaypalHelper.php:
<?php
/** Paypal Helper part of the PayPal IPN plugin.
*
* #author Nick Baker
* #link http://www.webtechnick.com
* #license MIT
*/
class PaypalHelper extends AppHelper {
var $helpers = array('Html','Form');
/**
* Setup the config based on the paypal_ipn_config in /Plugins/PaypalIpn/Config/paypal_ipn_config.php
*/
function __construct(View $View, $settings = array()){
//debug(APP_PATH);
//if(App::import(array('type' => 'File', 'name' => 'PaypalIpn.PaypalIpnConfig', 'file' => APP_PATH . DS . 'Config' . DS . 'paypal_ipn_config.php'))) {
//if(App::import(array('type' => 'File', 'name' => 'PaypalIpn.PaypalIpnConfig', 'file' => '/PaypalIpn/Config/paypal_ipn_config.php'))) {
if(App::import(array('type' => 'File', 'name' => 'PaypalIpn.PaypalIpnConfig', 'file' => APP.'Plugin'.DS.'paypal_ipn'.DS.'libs'))) {
$this->config =& new PaypalIpnConfig();
}
else {
$this->config =& new PaypalIpnConfig();
}
parent::__construct($View, $settings);
}
/**
* function button will create a complete form button to Pay Now, Donate, Add to Cart, or Subscribe using the paypal service.
* Configuration for the button is in /config/paypal_ip_config.php
*
* for this to work the option 'item_name' and 'amount' must be set in the array options or default config options.
*
* Example:
* $paypal->button('Pay Now', array('amount' => '12.00', 'item_name' => 'test item'));
* $paypal->button('Subscribe', array('type' => 'subscribe', 'amount' => '60.00', 'term' => 'month', 'period' => '2'));
* $paypal->button('Donate', array('type' => 'donate', 'amount' => '60.00'));
* $paypal->button('Add To Cart', array('type' => 'addtocart', 'amount' => '15.00'));
* $paypal->button('View Cart', array('type' => 'viewcart'));
* $paypal->button('Unsubscribe', array('type' => 'unsubscribe'));
* $paypal->button('Checkout', array(
* 'type' => 'cart',
* 'items' => array(
* array('item_name' => 'Item 1', 'amount' => '120', 'quantity' => 2, 'item_number' => '1234'),
* array('item_name' => 'Item 2', 'amount' => '50'),
* array('item_name' => 'Item 3', 'amount' => '80', 'quantity' => 3),
* )
* ));
* Test Example:
* $paypal->button('Pay Now', array('test' => true, 'amount' => '12.00', 'item_name' => 'test item'));
*
* #access public
* #param String $title takes the title of the paypal button (default "Pay Now" or "Subscribe" depending on option['type'])
* #param Array $options takes an options array defaults to (configuration in /config/paypal_ipn_config.php)
*
* helper_options:
* test: true|false switches default settings in /config/paypal_ipn_config.php between settings and testSettings
* type: 'paynow', 'addtocart', 'donate', 'unsubscribe', 'cart', or 'subscribe' (default 'paynow')
*
* You may pass in api name value pairs to be passed directly to the paypal form link. Refer to paypal.com for a complete list.
* some paypal API examples:
* amount: float value
* notify_url: string url
* item_name: string name of product.
* etc...
*/
function button($title = null, $options = array()){
if(is_array($title)){
$options = $title;
$title = isset($options['label']) ? $options['label'] : null;
}
$defaults = (isset($options['test']) && $options['test']) ? $this->config->testSettings : $this->config->settings;
$options = array_merge($defaults, $options);
$options['type'] = (isset($options['type'])) ? $options['type'] : "paynow";
switch($options['type']){
case 'subscribe': //Subscribe
$options['cmd'] = '_xclick-subscriptions';
$default_title = 'Subscribe';
$options['no_note'] = 1;
$options['no_shipping'] = 1;
$options['src'] = 1;
$options['sra'] = 1;
$options = $this->__subscriptionOptions($options);
break;
case 'addtocart': //Add To Cart
$options['cmd'] = '_cart';
$options['add'] = '1';
$default_title = 'Add To Cart';
break;
case 'viewcart': //View Cart
$options['cmd'] = '_cart';
$options['display'] = '1';
$default_title = 'View Cart';
break;
case 'donate': //Doante
$options['cmd'] = '_donations';
$default_title = 'Donate';
break;
case 'unsubscribe': //Unsubscribe
$options['cmd'] = '_subscr-find';
$options['alias'] = $options['business'];
$default_title = 'Unsubscribe';
break;
case 'cart': //upload cart
$options['cmd'] = '_cart';
$options['upload'] = 1;
$default_title = 'Checkout';
$options = $this->__uploadCartOptions($options);
break;
default: //Pay Now
$options['cmd'] = '_xclick';
$default_title = 'Pay Now';
break;
}
$title = (empty($title)) ? $default_title : $title;
$retval = "<form action='{$options['server']}/cgi-bin/webscr' method='post'><div class='paypal-form'>";
unset($options['server']);
foreach($options as $name => $value){
$retval .= $this->__hiddenNameValue($name, $value);
}
$retval .= $this->__submitButton($title);
return $retval;
}
/**
* __hiddenNameValue constructs the name value pair in a hidden input html tag
* #access private
* #param String name is the name of the hidden html element.
* #param String value is the value of the hidden html element.
* #access private
* #return Html form button and close form
*/
function __hiddenNameValue($name, $value){
return "<input type='hidden' name='$name' value='$value' />";
}
/**
* __submitButton constructs the submit button from the provided text
* #param String text | text is the label of the submit button. Can use plain text or image url.
* #access private
* #return Html form button and close form
*/
function __submitButton($text){
return "</div>" . $this->Form->end(array('label' => $text));
}
/**
* __subscriptionOptions conversts human readable subscription terms
* into paypal terms if need be
* #access private
* #param array options | human readable options into paypal API options
* INT period //paypal api period of term, 2, 3, 1
* String term //paypal API term //month, year, day, week
* Float amount //paypal API amount to charge for perioud of term.
* #return array options
*/
function __subscriptionOptions($options = array()){
//Period... every 1, 2, 3, etc.. Term
if(isset($options['period'])){
$options['p3'] = $options['period'];
unset($options['period']);
}
//Mount billed
if(isset($options['amount'])){
$options['a3'] = $options['amount'];
unset($options['amount']);
}
//Terms, Month(s), Day(s), Week(s), Year(s)
if(isset($options['term'])){
switch($options['term']){
case 'month': $options['t3'] = 'M'; break;
case 'year': $options['t3'] = 'Y'; break;
case 'day': $options['t3'] = 'D'; break;
case 'week': $options['t3'] = 'W'; break;
default: $options['t3'] = $options['term'];
}
unset($options['term']);
}
return $options;
}
/**
* __uploadCartOptions converts an array of items into paypal friendly name/value pairs
* #access private
* #param array of options that will be returned with proper paypal friendly name/value pairs for items
* #return array options
*/
function __uploadCartOptions($options = array()){
if(isset($options['items']) && is_array($options['items'])){
$count = 1;
foreach($options['items'] as $item){
foreach($item as $key => $value){
$options[$key.'_'.$count] = $value;
}
$count++;
}
unset($options['items']);
}
return $options;
}
}
?>
but i am getting this error in my browswer:
Fatal error: Class 'PaypalIpnConfig' not found in C:\xampp\htdocs\wifidrivescanportal\app\Plugin\PaypalIpn\View\Helper\PaypalHelper.php on line 23
line 23 is actually this line:
$this->config = new PaypalIpnConfig();
i dunno what's going on. even google cant provide me the answer.