How to Integrate PayPal Payment Gateway in PHP

Want to integrate Paypal Payment Gateway in PHP in a very simple manner? First of all, In order to receive PayPal payments, you must have a PayPal account and registered with a valid email id. If you don't have PayPal account, you should register in it. This is the first step of it.

First Step :-
https://developer.paypal.com/  Create a PayPal Sandbox account.

Second Step :-

Further, you need to create test ccounts for payment system. Here, take a look at Sandbox menu left-side top Sandbox > Test Accounts

Third Step :-

Check out below, There are two accounts, one for Buyer and another for Seller.

index.php :-

<?php

$paypal_url='https://www.sandbox.paypal.com/cgi-bin/webscr'; // Test Paypal API URL
$paypal_id='your_seller_id'; // Business email ID

?>
<h4>Welcome, Guest</h4>

<div class="product">          
    <div class="image">
        <img src="http://freewebmentor.com/wp-content/uploads/2014/01/logo.png" />
    </div>
    <div class="name">
        Paypal Payment System
    </div>
    <div class="price">
        Price:$10
    </div>
    <div class="btn">
    <form action="<?php echo $paypal_url; ?>" method="post" name="frmPayPal1">
    <input type="hidden" name="business" value="<?php echo $paypal_id; ?>">
    <input type="hidden" name="cmd" value="_xclick">
    <input type="hidden" name="item_name" value="freewebmentor Payment">
    <input type="hidden" name="item_number" value="1">
    <input type="hidden" name="credits" value="510">
    <input type="hidden" name="userid" value="1">
    <input type="hidden" name="amount" value="10">
    <input type="hidden" name="cpp_header_image" value="http://freewebmentor.com/wp-content/uploads/2014/01/logo.png">
    <input type="hidden" name="no_shipping" value="1">
    <input type="hidden" name="currency_code" value="USD">
    <input type="hidden" name="handling" value="0">
    <input type="hidden" name="cancel_return" value="http://freewebmentor.com/paypal-payment/cancel.php">
    <input type="hidden" name="return" value="http://freewebmentor.com/paypal-payment/success.php">
    <input type="image" src="https://www.sandbox.paypal.com/en_US/i/btn/btn_buynowCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
    <img alt="" border="0" src="https://www.sandbox.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
    </form>
    </div>
</div>

Payment-success.php :-

You will be redirected to the payment-success.php page after completing the Payment process succesfully. You will get a success message here.

<?php

$item_no            = $_REQUEST['item_number'];
$item_transaction   = $_REQUEST['tx']; // Paypal transaction ID
$item_price         = $_REQUEST['amt']; // Paypal received amount
$item_currency      = $_REQUEST['cc']; // Paypal received currency type

$price = '10.00';
$currency='USD';

//Rechecking the product price and currency details
if($item_price==$price && $item_currency==$currency)
{
    echo "<h1>Welcome, Guest</h1>";
    echo "<h1>Payment Successful</h1>";
}
else
{
    echo "<h1>Payment Failed</h1>";
}

?>

cancel.php :-

<?php
echo "<h1>Welcome, Guest</h1>";
echo "<h1>Payment Canceled</h1>";
?>