Md Emran Hasan

If you are like me, whenever you need to work with a 3rd party API or a gateway, you’d first search in Google for a possible wrapper for it in PHP. When it comes to supporting payment gateways, you get bunch of libraries in the search results who are fundamentally different. Some of them are old PHP 3/4 ones, some are new, some may need PEAR, etc.

As they were not required together in one single project, I used them whenever needed. But in one project, I needed them all. I thoughts it’s a chance and decided to stop using them and wrote my own ones where I can use the same methods for all the gateways.

So, here is an abstract PaymentGateway library which is being extended to be used for three popular payment gateways (Paypal, Authorize.net, and 2Checkout) in order to provide you with a similar way of using them. Note that the libraries are for basic usage only and do not contain options for recurring payments. Without much babble, let’s see a few examples of how you can use them.

You can straight-away download the package with all the libraries, examples, and readme.

Paypal

In order to process payments using Paypal, you’ll need to follow these steps:

1. Send the required information to Paypal (snippet 1). Be sure to specify your Paypal email where you want to receive the funds, the success and failure pages, the IPN page, and the product information. The example has the test mode ON, which you will not need in real scenario.

2. Create a payment success page where Paypal will send your customer after payment.

3. Create a payment failure page where Paypal will send your customer after failed payment.

4. Create a IPN page where Paypal will send payment notification in the background. Make sure you use/remove the test mode in conjunction with step 1. (snippet 2)

< ?php

// Include the paypal library
include_once ('Paypal.php');

// Create an instance of the paypal library
$myPaypal = new Paypal();

// Specify your paypal email
$myPaypal->addField('business', 'YOUR_PAYPAL_EMAIL');

// Specify the currency
$myPaypal->addField('currency_code', 'USD');

// Specify the url where paypal will send the user on success/failure
$myPaypal->addField('return', 'http://YOUR_HOST/payment/paypal_success.php');
$myPaypal->addField('cancel_return', 'http://YOUR_HOST/payment/paypal_failure.php');

// Specify the url where paypal will send the IPN
$myPaypal->addField('notify_url', 'http://YOUR_HOST/payment/paypal_ipn.php');

// Specify the product information
$myPaypal->addField('item_name', 'T-Shirt');
$myPaypal->addField('amount', '9.99');
$myPaypal->addField('item_number', '001');

// Specify any custom value
$myPaypal->addField('custom', 'muri-khao');

// Enable test mode if needed
$myPaypal->enableTestMode();

// Let's start the train!
$myPaypal->submitPayment();

Snippet 1

Greetings to all the readers of my blog.

Many of you have been writing to me in the last couple days when I took the site down. The main objective was to add the new theme and push a few code updates of the existing libraries. I really appreciate your concern and would like to reassure you that the site is up and will be up as usual Now, besides the slightly customized theme from Elegant Themes, I have put a few code updates. They are detailed below:

Extended Model for CodeIgniter

The original version of the Extended Model for CodeIgniter has been serving many people well. Although most users loved the nifty functions of the Model, many (including me) didn’t like the hacking of CI core to get this functionality. With the release of CodeIgniter 1.7, we can avoid that as we can now overload the Model class of CI like the other libraries. Follow this instruction:

1. Download the updated version from here
2. Put it in your application/libraries folder
3. In your model files, use it this way: class Product extends MY_Model
4. Everything else is same just like the original one

HTTP Class

There is not much update in this class except for a few bug fixes (thanks to you guys). Also, I have included a license file in the package as many of you have asked. It’s released under the MIT license. The original post is here for reference.

Download the update from here and the API reference is here.

Cross-domain AJAX calls using PHP

A minor bug fix in the code. Thanks to a few of you who pointed them out. Original post is here. Download the update from here.

I have accelerated plans for the blog in 2009 so stay tuned for some worthy posts in this month. And do write to me if you feel you have any questions/ideas/suggestions.

Cheers!

Feb 2009: An updated version of the code for CodeIgniter 1.7.x can be found here.

I developed this extension of CodeIgniter’s Model last year, but never had the chance to publish it. The main purpose of this extension is to make a dev’s life easy. This extension has been used by several of my devs at RBS and has been proved to increase productivity and reduce the number of painful small queries to write. Their enthusiasm has driven me to post this for the CI fans out there.

Without much babble, let’s get into point. I’ve explained the process of installing it and then showed some example uses. For starter, click here to download it. Now follow these steps to get started:

Feb 2009: A couple bugs have been fixed and library updated.

This is a wrapper HTTP class that uses either cURL or fsockopen to harvest resources from the web. It supports a handy subset of functionalists of HTTP that are mostly needed in day to day coding. Scripts who need to communicate with other servers will find it useful. If you’re looking to invoke any RESTful API and don’t want to bother adding a bunch of libraries for that simple thing, just put this class and you’re set.

Detailed documentation can be found here. And you can download the source from here.

UPDATE: Class added in Orchid – “PHP framwork for the rest of us”

Features

• Can use both cURL and fsockopen.
• Degrades to fsockopen if cURL not enabled.
• Supports HTTP Basic authentication.
• Supports defining custom request headers.
• Supports defining connection timeout values.
• Supports defining user agent and referral values.
• Supports both user-defined and persistent cookies.
• Supports secure connections (HTTPS) with and without cURL.
• Supports adding requests parameters for both GET and POST.
• Supports automatic redirection (maximum redirect can be defined).
• Returns HTTP response headers and response body data separately.

Example 1 – Simple Get (Facebook Application List)

   1: <?php

   2:  

   3: include_once('class.http.php');

   4:  

   5: $http = new Http();

   6:  

   7: $http->execute('http://www.facebook.com/apps/index.php?sort=6');

   8: echo ($http->error) ? $http->error : $http->result;

   9:  

  10: ?>

Example 2 – Invoking Yahoo Term Extraction API

   1: <?php

   2:  

   3: include_once('class.http.php');

   4:  

   5: $http = new Http();

   6:  

   7: $http->addParam('appid'   , 'a_really_random_yahoo_app_id');

   8: $http->addParam('context' , 'I am happy because I bought a new car');

   9: $http->addParam('output'  , 'xml');

  10:                         

  11: $http->execute('http://search.yahooapis.com/ContentAnalysisService/V1/termExtraction');

  12: echo ($http->error) ? $http->error : $http->result;

  13:  

  14: ?>

Example 3 – Logging into Basecamp (without using cURL!)

   1: <?php

   2:  

   3: include_once('class.http.php');

   4:  

   5: $http = new Http();

   6:  

   7: $http->useCurl(false);

   8: $http->setMethod('POST');

   9:  

  10: $http->addParam('user_name', 'emran');

  11: $http->addParam('password', 'hasan');

  12:  

  13: $http->setReferrer('https://someproject.projectpath.com/login');

  14: $http->execute('https://someproject.projectpath.com/login/authenticate');

  15:  

  16: echo ($http->error) ? $http->error : $http->result;

  17:  

  18: ?>

Example 4 – Getting a protected feed

   1: <?php

   2:  

   3: include_once('class.http.php');

   4:  

   5: $http = new Http();

   6: $http->setAuth('emran', 'hasan');

   7:  

   8: $http->execute('http://www.someblog.com/protected/feed.xml');

   9: echo ($http->error) ? $http->error : $http->result;

  10:  

  11: ?>

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