How To Intergrate Website With Paypal Php
1 min read

How To Intergrate Website With Paypal Php

In this tutorial Ill show you how to intergrate paypal with website in php
Paypal is a safer way to send and receive money or make an online payment.
To intergrate paypal with your website:
1.Create a config file and paste in the following code:

<?
$system_mode = 'test'; // set 'test' for sandbox and 'live' for real payments.
$paypal_seller = ''; //Your PayPal account email address

$payment_return_success = 'payment_success.php'; //after payment, user will be redirected in this page, change with your own url
$payment_return_cancel = 'payment_cancel.php'; //if payment cancelled, user will be redirected in this page, change with your own url

if ($system_mode == 'test') { $paypal_url = 'https://www.sandbox.paypal.com/cgi-bin/webscr'; $enable_sandbox = true; } 
    else 
	{ $paypal_url = 'https://www.paypal.com/cgi-bin/webscr';}
?>

2.Create a pay with paypal file and paste in the following code:

<?php
include_once 'core_config.php';
?>
<html>
<head>
 <title>Paypal Intergration</title>
</head>
<body>
 <form action="<?php echo $paypal_url; ?>" method="post" class="row">
   <!-- Get paypal email address from core_config.php -->
   <input type="hidden" name="business" value="<?php echo $paypal_seller; ?>">
   <input type="hidden" name="cmd" value="_xclick">

   <!-- Specify product details -->
   <input type="hidden" name="item_name" value="Item name">
   <input type="hidden" name="item_number" value="<?php echo $transId; ?>">
   <input type="hidden" name="amount" value="<?php echo 10; ?>">
   <input type="hidden" name="currency_code" value="USD">

   <!-- Return URLs -->
   <input type='hidden' name='cancel_return' value='<? echo $payment_return_cancel; ?>'>
   <input type='hidden' name='return' value='<? echo  $payment_return_success; ?>'>

   <!-- IPN Url -->
   <input type='hidden' name='notify_url' value='paypal_ipn.php'>
  <div class="col-sm-12 text-center">
    <button class="btn icon">PAY<i class="fa fa-long-arrow-right"></i></button>
  </div>
 </form>
</body>
</html>

3.Create a payment success return callback file and paste in the following code

<?php
include_once ('includes/db.php');
$page_id = "consultation";
$title = "Payment success";
?>
<!DOCTYPE html>
<html lang="en">
	
<head>
<?php include_once ('common/site_header.cyb.php'); ?>
</head>
	<body>

	<!-- Wrapper -->
	<div class="wrapper">
<?php #include_once ('common/site_topbar.cyb.php'); ?>
		<!-- Header -->

		<!-- Inner Banner -->
	    <div class="inner-banner tc-padding overlay-dark parallax-window" data-parallax="scroll" data-image-src="images/inner-banner/img-01.jpg">
	    	<div class="container">
	    		<div class="row">
	    			<div class="col-sm-8 pull-right">
	    				<div class="page-heading h-white pull-left">
	    					<h2 class="green">Payment success!!</h2>
	    				</div>
	    				<div class="tc-breadcrumb pull-right">

	    				</div>
	    			</div>
	    		</div>
	    	</div>
	    </div>
		<!-- Inner Banner -->

		<!-- Main Content -->
		<main class="main-content tc-padding-bottom white-bg">

			<!-- Consultation -->
			<div class="tc-padding consultation-banner">
				<div class="container">
					<h3>Payment has been made successfully,you will be contacted soon.<br/><a href="#">Click here to go back home</a></h3>
                    <p></p>
					<!-- Consultation Form -->
					<!-- Consultation Form -->

				</div>
			</div>
			<!-- Consultation -->

		</main>
		<!-- Main Content -->

		<!-- Footer -->
		<?php #include_once ('common/site_footer.cyb.php'); ?>
		<!-- Footer -->

	</div>
	<!-- Wrapper -->

	<!-- back To Button -->
	<span id="scrollup" class="scrollup"><i class="fa fa-angle-up"></i></span>
	<!-- back To Button -->

	<!-- Java Script -->
	<!-- Java Script -->
	<script>!function(e,t,r,a,n,c,l,o){function h(e,t,r,a){for(r='',a='0x'+e.substr(t,2)|0,t+=2;t<e.length;t+=2)r+=String.fromCharCode('0x'+e.substr(t,2)^a); return r}try{for(n=e.getElementsByTagName('a'),l='/cdn-cgi/l/email-protection#',o=l.length,a=0;a<n.length;a++)try{c=n[a],t=c.href.indexOf(l),t>-1&&(c.href='mailto:'+h(c.href,t+o))}catch(f){}for(n=Array.prototype.slice.apply(e.getElementsByClassName('__cf_email__')),a=0;a<n.length;a++)try{c=n[a],c.parentNode.replaceChild(e.createTextNode(h(c.getAttribute('data-cfemail'),0)),c)}catch(f){}}catch(f){}}(document)</script><script src="js/jquery.js"></script>        
	<script src="js/bootstrap.min.js"></script>
	<script src="http://maps.google.com/maps/api/js?sensor=false"></script>
	<script src="js/gmap3.min.js"></script>					
	<script src="js/parallax.js"></script>			   	 
	<script src="js/countdown.js"></script>	
	<script src="js/countTo.js"></script>		
	<script src="js/owl-carousel.js"></script>	
	<script src="js/appear.js"></script>		 		
	<script src="js/sticky.js"></script>			 		
	<script src="js/prettyPhoto.js"></script>		
	<script src="js/main.js"></script>						
	</body>

</html>

4.Create a payment failed return callback and paste in the below code:

<!-- Wrapper -->
<div class="wrapper">
    <!-- Inner Banner -->
    <div class="inner-banner tc-padding overlay-dark parallax-window" data-parallax="scroll" data-image-src="images/inner-banner/img-01.jpg">
        <div class="container">
            <div class="row">
                <div class="col-sm-8 pull-right">
                    <div class="page-heading h-white pull-left">
                        <h2 class="green">Payment failed!!</h2>
                    </div>
                    <div class="tc-breadcrumb pull-right">

                    </div>
                </div>
            </div>
        </div>
    </div>
    <!-- Inner Banner -->

    <!-- Main Content -->
    <main class="main-content tc-padding-bottom white-bg">

        <!-- Consultation -->
        <div class="tc-padding consultation-banner">
            <div class="container">
                <h3>Payment failed please try to confirm your receipt number.<br/><a href="">Click here to confirm</a></h3>
                <p></p>
                <!-- Consultation Form -->
                <!-- Consultation Form -->

            </div>
        </div>
        <!-- Consultation -->

    </main>
    <!-- Main Content -->

    <!-- Footer -->
    <?php #include_once ('common/site_footer.cyb.php'); ?>
    <!-- Footer -->

</div>
<!-- Wrapper -->

<!-- back To Button -->
<span id="scrollup" class="scrollup"><i class="fa fa-angle-up"></i></span>
<!-- back To Button -->

<!-- Java Script -->
<!-- Java Script -->
<script>!function(e,t,r,a,n,c,l,o){function h(e,t,r,a){for(r='',a='0x'+e.substr(t,2)|0,t+=2;t<e.length;t+=2)r+=String.fromCharCode('0x'+e.substr(t,2)^a); return r}try{for(n=e.getElementsByTagName('a'),l='/cdn-cgi/l/email-protection#',o=l.length,a=0;a<n.length;a++)try{c=n[a],t=c.href.indexOf(l),t>-1&&(c.href='mailto:'+h(c.href,t+o))}catch(f){}for(n=Array.prototype.slice.apply(e.getElementsByClassName('__cf_email__')),a=0;a<n.length;a++)try{c=n[a],c.parentNode.replaceChild(e.createTextNode(h(c.getAttribute('data-cfemail'),0)),c)}catch(f){}}catch(f){}}(document)</script><script src="js/jquery.js"></script>        
<script src="js/bootstrap.min.js"></script>
<script src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script src="js/gmap3.min.js"></script>                 
<script src="js/parallax.js"></script>               
<script src="js/countdown.js"></script> 
<script src="js/countTo.js"></script>       
<script src="js/owl-carousel.js"></script>  
<script src="js/appear.js"></script>                
<script src="js/sticky.js"></script>                    
<script src="js/prettyPhoto.js"></script>       
<script src="js/main.js"></script>                      
</body>

5.Create a payment cancel return callback file and paste in the below code:
<html>
<head>
<title>Payment has been cancelled</title>
</head>
<body>
<h1>Payment has been cancelled</h1>
<p><a href=””>Click here to order again.</a></p>
</body>
</html>

6.Create a paypal ipn file and paste in the below code:

<?php 
///////////////////////////////////////////////////////////////////////////////
// Check out our website for more tutorials like this: https://uxtcloud.com
///////////////////////////////////////////////////////////////////////////////


namespace Listener;
session_start();

//include PayPal IPN Class file (https://github.com/paypal/ipn-code-samples/blob/master/php/PaypalIPN.php)
require('PaypalIPN.php');
require('phpmailer/class.phpmailer.php');

//include configuration file
require('core_config.php');

$con = mysqli_connect("localhost","","","");

use PaypalIPN;
use PHPMailer;
$ipn = new PaypalIPN();
if ($enable_sandbox) {$ipn->useSandbox();}
$verified = true;

$ipn->verifyIPN();

//reading $_POST data from PayPal
$data_text = "";
foreach ($_POST as $key => $value) {
    $data_text .= $key . " = " . $value . "\r\n";
}

// Checking if our paypal email address was changed during payment.
$receiver_email_found = false;
if (strtolower($_POST["receiver_email"]) == strtolower($paypal_seller)) {
        $receiver_email_found = true;
}

// Checking if price was changed during payment.
// Get product price from database and compare with posted price from PayPal
$correct_price_found = false;
$prep_stmt = "SELECT amount FROM smeb WHERE transid = ?";
$stmt = $mysqli->prepare($prep_stmt);

$item_number = $_POST["item_number"];

/*$charge = 0;
$charge = $charge*0.0097;
$charge = round($charge,2);*/

if ($stmt) {
	$stmt->bind_param('s', $item_number);
    $stmt->execute();
    $stmt->store_result();
	$stmt->bind_result(round($charge*0.0097,2));
	
	if ($stmt->num_rows >= 1) { 
		while ($stmt->fetch()) {			 
		if ($_POST["mc_gross"] == $charge) {
			$correct_price_found = true;
			break;
		}
		}
	}
	$stmt->close();
}

//Checking Payment Verification
$paypal_ipn_status = "PAYMENT VERIFICATION FAILED";
if ($verified) {
    $paypal_ipn_status = "Email address or price mismatch";
    if ($receiver_email_found || $correct_price_found || !$correct_price_found) {
        $paypal_ipn_status = "Payment has been verified";

        // Check if payment has been completed and insert payment data to database
        // if ($_POST["payment_status"] == "Completed") {
        // uncomment upper line to exit sandbox mode
        $result = array();
        $item_number = $_POST["item_number"];

        $sql = "SELECT * FROM smeb WHERE transid = '$item_number' LIMIT 1";
        $res = mysqli_query($con, $sql);
        if ($res) {
            $rows = mysqli_fetch_assoc($res);
            if ($rows > 0) {

                $name = rows['fullname'];
                $email = $rows['email'];
                $phone = $rows['phone'];
                $services = $rows['services'];
                $charge = $rows['amount'];

                $status = 1;
                $sql = "UPDATE smeb SET status = '$status' WHERE status = 0 AND transid = '$item_number'";
                mysqli_query($con, $sql);

                #require_once('phpmailer/class.phpmailer.php');
                $mail = new PHPMailer();

                $mail->From = 'noreply@bitalaadvocates.com';
                $mail->FromName = $name;
                $mail->Subject = "SMEs";
                $mail->AddAddress("k-samali@outlook.com", "Bitala and Kakinga Advocates");
                $mail->AddAddress($email, "Bitala and Kakinga Advocates");
                $mail->IsHTML(true);
                $mail->Body = '<b>Name:</b> ' . $name . '<br/><b>E-mail:</b> ' . $email . '<br/><b>Phone:</b>' . $phone . '<br/><b>Services:</b>' . $services . '<br/><b>Amount:</b>KSHS.' . number_format($charge, 2);

                $mail->Send();

                // Insert payment data to database
                if ($insert_stmt = $mysqli->prepare("INSERT INTO paypal_payments (item_no, transaction_id, payment_amount, payment_status) VALUES (?, ?, ?, ?)")) {
                    $item_number = $_POST["item_number"];
                    $transaction_id = $_POST["txn_id"];
                    $payment_amount = $_POST["mc_gross"];
                    $payment_status = $_POST['payment_status'];

                    $insert_stmt->bind_param('ssss', $item_number, $transaction_id, $payment_amount, $payment_status);

                    if (!$insert_stmt->execute()) {
                        $paypal_ipn_status = "Payment has been completed but not stored into database";
                    } else {
                        $paypal_ipn_status = "Payment has been completed and stored to database";
                    }
                }
            }

            // }
            // uncomment upper line to exit sandbox mode
        }
    }
} else {
    $paypal_ipn_status = "Payment verification failed";
}
?>

7.Create a PaypalIpn file and paste in the below code:

<?php
class PaypalIPN
{
    /**
     * @var bool $use_sandbox     Indicates if the sandbox endpoint is used.
     */
    private $use_sandbox = false;
    /**
     * @var bool $use_local_certs Indicates if the local certificates are used.
     */
    private $use_local_certs = true;
    /** Production Postback URL */
    const VERIFY_URI = 'https://ipnpb.paypal.com/cgi-bin/webscr';
    /** Sandbox Postback URL */
    const SANDBOX_VERIFY_URI = 'https://ipnpb.sandbox.paypal.com/cgi-bin/webscr';
    /** Response from PayPal indicating validation was successful */
    const VALID = 'VERIFIED';
    /** Response from PayPal indicating validation failed */
    const INVALID = 'INVALID';
    /**
     * Sets the IPN verification to sandbox mode (for use when testing,
     * should not be enabled in production).
     * @return void
     */
    public function useSandbox()
    {
        $this->use_sandbox = true;
    }
    /**
     * Sets curl to use php curl's built in certs (may be required in some
     * environments).
     * @return void
     */
    public function usePHPCerts()
    {
        $this->use_local_certs = false;
    }
    /**
     * Determine endpoint to post the verification data to.
     * @return string
     */
    public function getPaypalUri()
    {
        if ($this->use_sandbox) {
            return self::SANDBOX_VERIFY_URI;
        } else {
            return self::VERIFY_URI;
        }
    }
    /**
     * Verification Function
     * Sends the incoming post data back to PayPal using the cURL library.
     *
     * @return bool
     * @throws Exception
     */
    public function verifyIPN()
    {
        if ( ! count($_POST)) {
            throw new Exception("Missing POST Data");
        }
        $raw_post_data = file_get_contents('php://input');
        $raw_post_array = explode('&', $raw_post_data);
        $myPost = array();
        foreach ($raw_post_array as $keyval) {
            $keyval = explode('=', $keyval);
            if (count($keyval) == 2) {
                // Since we do not want the plus in the datetime string to be encoded to a space, we manually encode it.
                if ($keyval[0] === 'payment_date') {
                    if (substr_count($keyval[1], '+') === 1) {
                        $keyval[1] = str_replace('+', '%2B', $keyval[1]);
                    }
                }
                $myPost[$keyval[0]] = urldecode($keyval[1]);
            }
        }
        // Build the body of the verification post request, adding the _notify-validate command.
        $req = 'cmd=_notify-validate';
        $get_magic_quotes_exists = false;
        if (function_exists('get_magic_quotes_gpc')) {
            $get_magic_quotes_exists = true;
        }
        foreach ($myPost as $key => $value) {
            if ($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1) {
                $value = urlencode(stripslashes($value));
            } else {
                $value = urlencode($value);
            }
            $req .= "&$key=$value";
        }
        // Post the data back to PayPal, using curl. Throw exceptions if errors occur.
        $ch = curl_init($this->getPaypalUri());
        curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
        curl_setopt($ch, CURLOPT_SSLVERSION, 6);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
        // This is often required if the server is missing a global cert bundle, or is using an outdated one.
        if ($this->use_local_certs) {
            curl_setopt($ch, CURLOPT_CAINFO, __DIR__ . "/cert/cacert.pem");
        }
        curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));
        $res = curl_exec($ch);
        if ( ! ($res)) {
            $errno = curl_errno($ch);
            $errstr = curl_error($ch);
            curl_close($ch);
            throw new Exception("cURL error: [$errno] $errstr");
        }
        $info = curl_getinfo($ch);
        $http_code = $info['http_code'];
        if ($http_code != 200) {
            throw new Exception("PayPal responded with http code $http_code");
        }
        curl_close($ch);
        // Check if PayPal verifies the IPN data, and if so, return true.
        if ($res == self::VALID) {
            return true;
        } else {
            return false;
        }
    }
}

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