Paypal Payment Gateway Integration in PHP Codeigniter Example

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Today, We want to share with you codeigniter paypal integration.In this post we will show you credit card payment gateway integration in codeigniter, hear for Integration of Paypal single payment and single payouts with codeigniter we will give you demo and example for implement.In this post, we will learn about payment gateway form php source code with an example.

how to integrate paypal with codeigniter?

Step 1 : First of all you can simple Download Paypal Payment Gateway Library Paypal Payment Gateway library for Codeigniter.

paypallib_config.php file => will be placed in the application/config/ directory.
paypal_lib.php file => will be placed in the application/libraries/ directory

Single Payment With Codeigniter

Step 2 : Create Backend database tables to fetch and store responses 

CREATE TABLE `items` (
 `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,
 `visitor_id` int(11) NOT NULL,
 `item_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 New Controller to call paypal api

application/controllers/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('item');
		$this->load->database();
	}

	function index(){
		$response = array();
		$response['items'] = $this->item->getProducts();
		$this->load->view('items/index', $response);
	}

function buyProduct($id){

	$returnURL = base_url().'paypal/success'; //payment success url
	$failURL = base_url().'paypal/fail'; //payment fail url
	$notifyURL = base_url().'paypal/ipn'; //ipn url

	$item = $this->item->getProducts($id);
	$visitorID = 1; //current visitor 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', $item['name']);
	$this->paypal_lib->add_field('custom', $visitorID);
	$this->paypal_lib->add_field('item_number', $item['id']);
	$this->paypal_lib->add_field('amount', $item['price']);
	$this->paypal_lib->image($logo);

	$this->paypal_lib->paypal_auto_form();
}

function paymentSuccess(){
	$paymentData = $this->input->get();

	$response['item_number'] = $paymentData['item_number'];
	$response['txn_id'] = $paymentData["tx"];
	$response['payment_amt'] = $paymentData["amt"];
	$response['currency_code'] = $paymentData["cc"];
	$response['status'] = $paymentData["st"];

	$this->load->view('paypal/paymentSuccess', $response);
}

function paymentFail(){
	$this->load->view('paypal/paymentFail');
}

function ipn(){
//paypal return transaction details array
$paymentData = $this->input->post();

$response['visitor_id'] = $paymentData['custom'];
$response['item_id'] = $paymentData["item_number"];
$response['txn_id'] = $paymentData["txn_id"];
$response['payment_gross'] = $paymentData["mc_gross"];
$response['currency_code'] = $paymentData["mc_currency"];
$response['payer_email'] = $paymentData["payer_email"];
$response['payment_status'] = $paymentData["payment_status"];

$paypalURL = $this->paypal_lib->paypal_url;
$solution = $this->paypal_lib->curlPost($paypalURL,$paymentData);

if(preg_match("/VERIFIED/i",$solution)){
$this->item->storeTransaction($response);
}
}
}

Step 4 : Create Paypal Model to interact with database

application/models/Paypal_model.php 

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Product extends CI_Model{
    public function __construct()
    {
        $this->load->database();
    }

    public function getProducts($id = ''){
        $this->db->select('id,name,image,price');
        $this->db->from('items');
        if($id){
            $this->db->where('id',$id);
            $query = $this->db->get();
            $solution = $query->row_array();
        }else{
            $this->db->order_by('name','asc');
            $query = $this->db->get();
            $solution = $query->result_array();
        }
        return !empty($solution)?$solution:false;
    }
 
    public function storeTransaction($response = array()){
        $insert = $this->db->insert('payments',$response);
        return $insert?true:false;
    }
}

Step 5 : Create View File

application/views/items/index.php 

<!DOCTYPE html>
<html>
<head>
  <title>Codeigniter Paypal Integration Example - www.pakainfo.com</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($items)): foreach($items as $item): ?>
        <div class="thumbnail">
            <img src="<?php echo base_url().'assets/images/'.$item['image']; ?>" alt="">
            <div class="caption">
                <h4 class="pull-right">$<?php echo $item['price']; ?></h4>
                <h4><a href="javascript:void(0);"><?php echo $item['name']; ?></a></h4>
            </div>
            <a href="<?php echo base_url().'items/buyProduct/'.$item['id']; ?>"><img src="<?php echo base_url(); ?>assets/images/buy-button" style="width: 70px;"></a>
        </div>
        <?php endforeach; endif; ?>
    </div>
  </div>
</body>
</html>

Step 6 :create a new file for payment success response paymentSuccess.php

application/views/paypal/paymentSuccess.php

<!DOCTYPE html>
<html>
<head>
<title>Transaction Successfull - Codeigniter Paypal Integration Example - www.pakainfo.com</title>
<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>

Step 7:create a file for payment failure

application/views/paypal/paymentFail.php 

<html>
<head>
<title>Transaction Fail - Codeigniter Paypal Integration Example - www.pakainfo.com</title>
<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>

From sandbox to live integration, just change two places in config file application/config/paypallib_config.php

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$config['sandbox'] = FALSE;
$config['business'] = '[email protected]';

Single payout with codeigniter

You have to just define client id , secret key and also log path if you need log.

private function  curl_request($url, $method, $headers = [], $response = [], $curl_options = []){
 
        $curl = curl_init();
 
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_TIMEOUT, 0);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
 
        //--- If any headers set add them to curl request
        if(!empty($headers)){
            curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
        }
 
        //--- Set the request type , GET, POST, PUT or DELETE
        switch($method){
            case "POST":
            curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
            break;
        case "PUT":
            curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "PUT");
            break;
        case "DELETE":
            curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "DELETE");
            break;
        default:
            curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "GET");
            break;
        }
 
        //--- If any response is supposed to be send along with request add it to curl request
        if($response){
            curl_setopt($curl, CURLOPT_POSTFIELDS, $response);
        }
        //--- Any extra curl options to add in curl object
        if($curl_options){
            foreach($curl_options as $option_key => $option_value){
                curl_setopt($curl, $option_key, $option_value);
            }
        }
 
        $response = curl_exec($curl);
        $error = curl_error($curl);
        curl_close($curl);
 
        //--- If curl request returned any error return the error
        if ($error) {
            return "CURL Error: $error";
        }
        //--- Return response received from call
        return $response;
}
 
 
public function get_access_token()
{
 
    //--- Headers for our token request
    $headers[] = "Accept: application/json";
    $headers[] = "Content-Type: application/x-www-form-urlencoded";
 
    //--- Data field for our token request
    $response = "grant_type=client_credentials";
 
    //--- Pass client id & client secrent for authorization
    $curl_options[CURLOPT_USERPWD] = $this->CI->config->item('client_id') . ":" . $this->CI->config->item('client_secret');
 
    $token_request = $this->curl_request($this->CI->config->item('PAYPAL_TOKEN_URL'), "POST", $headers, $response, $curl_options);
    $token_request = json_decode($token_request);
    if(isset($token_request->error)){
 
        $solution['no_error'] = FALSE;
 
        $solution['message_error'] =  $token_request->error_description;
 
 
 
    }else{
 
        $solution['no_error'] = TRUE;
 
        $solution['token_request'] = $token_request ;
 
    } 
 
    return $solution;
 
}
 
 
function transfer_money_from_business_to_personal($email_receiver,$cifra)
{   
 
    if ($email_receiver=='') {
 
      $this->log_ipn_test('Mail vuota impossibile pagare');
      die();
    }
 
    //restituisce un array per poter inserire nel caso gli errori
    $solution= $this->get_access_token();
 
 
 
    if($solution['no_error']){
 
 
        $token_request = $solution['token_request'];
 
        $this->log_ipn_test('Token Ok');
 
        $headers = $response = [];
        $headers[] = "Content-Type: application/json";
        $headers[] = "Authorization: Bearer $token_request->access_token";
 
        $time = time();
        $sender_batch_header["sender_batch_id"] = $time;
        $sender_batch_header["email_subject"]   = "Payout Received";
        $sender_batch_header["email_message"]   = "You have received a payout, Thank you for using our services";
 

        $receiver["recipient_type"] = "EMAIL";
        $receiver["note"] = "Thank you for your services";
        $receiver["sender_item_id"] = $time++;
        $receiver["receiver"] = $email_receiver;
        $receiver["amount"]["value"] = $cifra;
        $receiver["amount"]["currency"] = "EUR";
        $outputs[] = $receiver;
        /*
        //--- Second receiver
        $receiver["recipient_type"] = "EMAIL";
        $receiver["note"] = "You received a payout for your services";
        $receiver["sender_item_id"] = $time++;
        $receiver["receiver"] = "[email protected]";
        $receiver["amount"]["value"] = 15.00;
        $receiver["amount"]["currency"] = "USD";
        $outputs[] = $receiver;
        */
        $response["sender_batch_header"] = $sender_batch_header;
        $response["outputs"] = $outputs;
 
        //--- Send payout request
        $payout = $this->curl_request($this->CI->config->item('PAYPAL_PAYOUTS_URL'), "POST", $headers, json_encode($response));
 
        $payout = json_decode($payout);
        //$this->log_ipn_test("|2|$payout[0]['batch_header']");
        //$this->log_ipn_test("|2|$payout[0]['batch_header']['payout_batch_id']");
 
 
 
        $headers2 = $response2 = [];
        //--- Headers for payment description
        $headers2[] = "Content-Type: application/json";
        $headers2[] = "Authorization: Bearer $token_request->access_token";
 
        $link = $payout->links[0]->href;
 
        $this->log_ipn_test($link);
 
        sleep(3); //sleep to prevent PENDING
 
        $dati_pagamento = $this->curl_request($link, "GET", $headers2);
 
        $this->log_ipn_test(json_encode($dati_pagamento));
 
        var_dump($dati_pagamento);
 
        if($payout){
 
            return TRUE;
 
        }else{
 
            return FALSE;
 
        }
 
 
    }else{
 
        $this->log_ipn_test($solution['message_error']);
 
        return FALSE;
 
 
    }
 
} //fine transfer_money_from_business_to_personal
public function log_ipn_test($response=''){ 
         
        $payoutLogFile=PAYOUT_IPNLOG_PATH;
        // Success or failure being logged?
        if ($response) $text .= $response;  
        // Write to log
        $fp=fopen($payoutLogFile,'a');
        fwrite($fp, $text . "\n\n");
        fclose($fp);  // close file
    }

I hope you get an idea about payfast payment gateway integration in codeigniter.
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