Paypal IPN plugin (Paypal Instant Payment Notification)

Version 4.0.0
Author: Nick Baker (nick@webtechnick.com)
Website: http://www.webtechnick.com

Get it

GIT: git@github.com:webtechnick/CakePHP-Paypal-IPN-Plugin.git

Required:

CakePHP 2.x

Note: CakePHP 1.3 use the cakephp1.3 branch

More From WebTechNick

http://github.com/webtechnick

CHANGELOG:

1.0: Initial release
1.1: Added cleaner routes
2.0: Helper added
2.1: Added cake schema install script
2.2: Added paypal unsubscribe type
2.2.1: Bug fix with subscription issues
2.2.2: Fixed validation issues with paypal button in strict doctype
3.0: Added new basic Paypal IPN email capabality.
3.5 Added checkout feature for multiple items paypal button. Documentation bellow
3.5.1: Renamed columns option_name_1 and option_name_2 to option_name1 and option_name2 respectively
3.5.2: Updating to latest conventions in CakePHP 1.3, no longer requires Auth, all cart items will be reviewable in paypal_items table
3.6.0: Adding View Cart button option
4.0.0: CakePHP 2.x ready.

Install:

Copy plugin into your app/Plugin/PaypalIpn directory
Load the plugin in bootstrap.php
```
 CakePlugin::load('PaypalIpn');
```
Run the schema to create the required tables.
```
 $ cake schema create --plugin PaypalIpn
```

Add the following into your /app/Config/Routes.php file (optional):

 /* Paypal IPN plugin */
 Router::connect('/paypal_ipn/process', array('plugin' => 'paypal_ipn', 'controller' => 'instant_payment_notifications', 'action' => 'process'));
 /* Optional Route, but nice for administration */
 Router::connect('/paypal_ipn/:action/*', array('admin' => 'true', 'plugin' => 'paypal_ipn', 'controller' => 'instant_payment_notifications', 'action' => 'index'));
 /* End Paypal IPN plugin */

Paypal Setup:

I suggest you start a sandbox account at https://developer.paypal.com
Enable IPN in your account.

Administration: (optional) If you want to use the built in admin access to IPNs:

Make sure you're logged in as an Administrator via the Auth component.
Navigate to www.yoursite.com/paypal_ipn

Paypal Button Helper: (optional) if you plan on using the paypal helper for your PayNow or Subscribe Buttons

Update Config/paypal_ipn_config.php with your paypal information

Add PaypalIpn.Paypal to your helpers list in AppController.php

 public $helpers = array('Html','Form','PaypalIpn.Paypal');

Usage: (view the actual Plugin/PaypalIpn/View/Helper/PaypalHelper.php for more information)

	$this->Paypal->button(String tittle, Options array); 
 
	$this->Paypal->button('Pay Now', array('amount' => '12.00', 'item_name' => 'test item'));
	$this->Paypal->button('Subscribe', array('type' => 'subscribe', 'amount' => '60.00', 'term' => 'month', 'period' => '2'));
	$this->Paypal->button('Donate', array('type' => 'donate', 'amount' => '60.00'));
	$this->Paypal->button('Add To Cart', array('type' => 'addtocart', 'amount' => '15.00'));
	$this->Paypal->button('View Cart', array('type' => 'viewcart', 'amount' => '15.00'));
	$this->Paypal->button('Unsubscribe', array('type' => 'unsubscribe'));
	$this->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
	$this->Paypal->button('Pay Now', array('test' => true, 'amount' => '12.00', 'item_name' => 'test item'));

Alternatively to Paypal Helper

Instead of the Paypal Helper you can use your custom buttons but make sure to set notify_url to your configured route.

<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
	...
	<input type="hidden" name="notify_url" value="http://www.yoursite.com/paypal_ipn/process" />
	...
</form>

It is generally recommened to use the paypal helper as it will generate everything for you based on your configurations

Paypal Notification Callback:

Create a function in your app/Controller/AppController.php like so:

function afterPaypalNotification($txnId){
	//Here is where you can implement code to apply the transaction to your app.
	//for example, you could now mark an order as paid, a subscription, or give the user premium access.
	//retrieve the transaction using the txnId passed and apply whatever logic your site needs.
	
	$transaction = ClassRegistry::init('PaypalIpn.InstantPaymentNotification')->findById($txnId);
	$this->log($transaction['InstantPaymentNotification']['id'], 'paypal');
	
	//Tip: be sure to check the payment_status is complete because failure 
	//     are also saved to your database for review.
	
	if ($transaction['InstantPaymentNotification']['payment_status'] == 'Completed') {
		//Yay!  We have monies!
	}	else {
		//Oh no, better look at this transaction to determine what to do; like email a decline letter.
	}
}

Basic Email Feature:

Utility method to send basic emails based on a paypal IPN transaction. This method is very basic, if you need something more complicated I suggest creating your own method in the afterPaypalNotification function you build in the app_controller.php

$IPN = ClassRegistry::init('PaypalIpn.InstantPaymentNotification');
$IPN->id = '4aeca923-4f4c-49ec-a3af-73d3405bef47';
$IPN->email('Thank you for your transaction!');

//OR passed in as an array of options
$IPN->email(array(
	'id' => '4aeca923-4f4c-49ec-a3af-73d3405bef47',
	'subject' => 'Donation Complete!',
	'message' => 'Thank you for your donation!',
	'sendAs' => 'text'
));

Hint: use this in your afterPaypalNotification callback in your AppController.php

function afterPaypalNotification($txnId){
	ClassRegistry::init('PaypalIpn.InstantPaymentNotification')->email(array(
		'id' => $txnId,
		'subject' => 'Thanks!',
		'message' => 'Thank you for the transaction!'
	));
}

Email Options:

id: id of instant payment notification to base email off of
subject: subject of email (default: Thank you for your paypal transaction)
sendAs: html | text (default: html)
to: email address to send email to (default: ipn payer_email)
from: from email address (default: ipn business)
cc: array of email addresses to carbon copy to (default: array())
bcc: array of email addresses to blind carbon copy to (default: array())
layout: layout of email to send (default: default)
template: template of email to send (default: null)
log: boolean true | false if you'd like to log the email being sent. (default: true)
message: actual body of message to be sent (default: null)

webtechnick/CakePHP-Paypal-IPN-Plugin