How to integration paypal payment gateway in codeigniter

In this tutorial, we will tell you how to integration paypal payment gateway in codeigniter Framework.

The Paypal payment gateway is a popular payment gateway method and it is easily used for the project. so many developers prefer that payment gateway method.

PayPal is a secure payment method and it’s work-based using API. it provides two environments for the user like a sandbox and live.

Overview

Step 1: Download Paypal Payment Gateway Library
Step 2: Create Database Tables
Step 3: Create Controller
Step 4: Create a Model
Step 5: Create View File

Step 1: Download Paypal Payment Gateway Library

If you want to download the PayPal payment Gateway library then you can download it on https://github.com/xpertphp/paypal-payment-gateway-library-for-codeigniter git repository.
Step 2: Create Database Tables
In this step, we have to create two tables in the database, so we will create a database using the below code.

CREATE TABLE `products` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
 `image` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
 `price` float(10,2) NOT NULL,
 `status` tinyint(1) NOT NULL DEFAULT '1',
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE `payments` (
 `payment_id` int(11) NOT NULL AUTO_INCREMENT,
 `user_id` int(11) NOT NULL,
 `product_id` int(11) NOT NULL,
 `txn_id` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
 `payment_gross` float(10,2) NOT NULL,
 `currency_code` varchar(5) COLLATE utf8_unicode_ci NOT NULL,
 `payer_email` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
 `payment_status` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
 PRIMARY KEY (`payment_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

Step 3: Create Controller
In this step, we will create a Products.php file in the “application/controller” directory and paste the below code in this controller.
application/controller/Products.php

<?php defined('BASEPATH') OR exit('No direct script access allowed');
class Products extends CI_Controller
{
    function  __construct() {
        parent::__construct();
        $this->load->library('paypal_lib');
        $this->load->model('product');
        $this->load->database();
    }
     
    function index(){
        $data = array();
        //get products inforamtion from database table
        $data['products'] = $this->product->getProducts();
        //loav view and pass the products information to view
        $this->load->view('products/index', $data);
    }
     
    function buyProduct($id){
        //Set variables for paypal form
        $returnURL = base_url().'paypal/success'; //payment success url
        $failURL = base_url().'paypal/fail'; //payment fail url
        $notifyURL = base_url().'paypal/ipn'; //ipn url
        //get particular product data
        $product = $this->product->getProducts($id);
        $userID = 1; //current user id
        $logo = base_url().'Your_logo_url';
         
        $this->paypal_lib->add_field('return', $returnURL);
        $this->paypal_lib->add_field('fail_return', $failURL);
        $this->paypal_lib->add_field('notify_url', $notifyURL);
        $this->paypal_lib->add_field('item_name', $product['name']);
        $this->paypal_lib->add_field('custom', $userID);
        $this->paypal_lib->add_field('item_number',  $product['id']);
        $this->paypal_lib->add_field('amount',  $product['price']);        
        $this->paypal_lib->image($logo);
         
        $this->paypal_lib->paypal_auto_form();
    }
 
     function paymentSuccess(){
 
        //get the transaction data
        $paypalInfo = $this->input->get();
           
        $data['item_number'] = $paypalInfo['item_number']; 
        $data['txn_id'] = $paypalInfo["tx"];
        $data['payment_amt'] = $paypalInfo["amt"];
        $data['currency_code'] = $paypalInfo["cc"];
        $data['status'] = $paypalInfo["st"];
         
        //pass the transaction data to view
        $this->load->view('paypal/paymentSuccess', $data);
     }
      
     function paymentFail(){
        //if transaction cancelled
        $this->load->view('paypal/paymentFail');
     }
      
     function ipn(){
        //paypal return transaction details array
        $paypalInfo    = $this->input->post();
 
        $data['user_id'] = $paypalInfo['custom'];
        $data['product_id']    = $paypalInfo["item_number"];
        $data['txn_id']    = $paypalInfo["txn_id"];
        $data['payment_gross'] = $paypalInfo["mc_gross"];
        $data['currency_code'] = $paypalInfo["mc_currency"];
        $data['payer_email'] = $paypalInfo["payer_email"];
        $data['payment_status']    = $paypalInfo["payment_status"];
 
        $paypalURL = $this->paypal_lib->paypal_url;        
        $result    = $this->paypal_lib->curlPost($paypalURL,$paypalInfo);
         
        //check whether the payment is verified
        if(preg_match("/VERIFIED/i",$result)){
            //insert the transaction data into the database
            $this->product->storeTransaction($data);
        }
    }
}
?>

Step 4: Create a Model
In this step, we will create a Product.php file in the “application/models” directory and paste the below code in this model.
application/models/Product.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Product extends CI_Model{
    public function __construct()
    {
        $this->load->database();
    }
    //get and return product rows
    public function getProducts($id = ''){
        $this->db->select('id,name,image,price');
        $this->db->from('products');
        if($id){
            $this->db->where('id',$id);
            $query = $this->db->get();
            $result = $query->row_array();
        }else{
            $this->db->order_by('name','asc');
            $query = $this->db->get();
            $result = $query->result_array();
        }
        return !empty($result)?$result:false;
    }
 
    //insert transaction data
    public function storeTransaction($data = array()){
        $insert = $this->db->insert('payments',$data);
        return $insert?true:false;
    }
}
?>

Step 5: Create View File
So finally, we need to create two directories in the “application/views/” directory like product and PayPal. so we will create that directory and create files in that directory.
application/views/products/index.php

<!DOCTYPE html>
<html>
<head>
  <title>How To Integration Paypal Payment Gateway In Codeigniter - XpertPhp</title>
  <!-- Latest CSS -->
 <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
 <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script> 
</head>
<body>
  <div class="container">
    <h2 class="mt-3 mb-3">Products</h2>
    <div class="row">
        <?php if(!empty($products)): foreach($products as $product): ?>
        <div class="thumbnail">
            <img src="<?php echo base_url().'assets/images/'.$product['image']; ?>" alt="">
            <div class="caption">
                <h4 class="pull-right">$<?php echo $product['price']; ?></h4>
                <h4><a href="javascript:void(0);"><?php echo $product['name']; ?></a></h4>
            </div>
            <a href="<?php echo base_url().'products/buyProduct/'.$product['id']; ?>"><img src="<?php echo base_url(); ?>assets/images/buy-button" style="width: 70px;"></a>
        </div>
        <?php endforeach; endif; ?>
    </div>
  </div>
</body>
</html>

application/views/paypal/paymentSuccess.php

<!DOCTYPE html>
<html>
<head>
  <title>Transaction Successfull - Codeigniter Paypal Integration Example - XpertPhp</title>
  <!-- Latest CSS -->
 <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
 <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script> 
</head>
<body>
  <div class="container">
    <h2 class="mt-3 mb-3">Transaction Detalis</h2>
    <div class="row">
          <span>Your payment was successful done, thank you for purchase.</span><br/>
          <span>Item Number : 
              <strong><?php echo $item_number; ?></strong>
          </span><br/>
          <span>TXN ID : 
              <strong><?php echo $txn_id; ?></strong>
          </span><br/>
          <span>Amount Paid : 
              <strong>$<?php echo $payment_amt.' '.$currency_code; ?></strong>
          </span><br/>
          <span>Payment Status : 
              <strong><?php echo $status; ?></strong>
        </span><br/>
    </div>
  </div>
</body>
</html>

application/views/paypal/paymentFail.php

<!DOCTYPE html>
<html>
<head>
  <title>Transaction Fail - Codeigniter Paypal Integration Example - XpertPhp</title>
  <!-- Latest CSS -->
 <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
 <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script> 
</head>
<body>
  <div class="container">
    <h2 class="mt-3 mb-3">Transaction Detalis</h2>
    <div class="row">
       <p>Sorry! Your last transaction was cancelled.</p>
    </div>
  </div>
</body>
</html>

Note:- Paypal Payment Gateway Live

If you want to change the sandbox to live then you can follow the below details.
now we will open the “application/config/paypallib_config.php” file and change the sandbox, and business email, pin the config file. See the below changes in a config file.

//Change the SANDBOX environment to FALSE
$config['sandbox'] = FALSE;
//Change the BUSINESS EMAIL
$config['business'] = '[email protected]';