Guide on Using PHP for Payment Integration on Your E-commerce Website

Guide on Using PHP for Payment Integration on Your E-commerce Website

An ensured and secure online payment gateway service energizes perfect transitioning information. It offers an arranged to-use and speedy course of action that ensure more changes, decreasing the number of dropouts and grow the number of satisfied customers. One can pick the perfect instrument suitable for the industry and stay connected with overall brands through a singular stage. It helps in the business area with smooth portion experience for suppliers and their shippers.

Payment gateway integration is a technical service which is used to process Credit Card, Debit card and Net Banking transactions while accepting online payments from your customers. But, before integrating a payment gateway into your website, you need to determine your priorities. In short, you need to decide what you want from your payment gateway. Next, you need to select the right integration method that you can choose between hosted payment forms, payment module or using your own code.

payment gateway integration using php 2019

There are various payment gateway options like PayPal, Paytm, PayUmoney etc. available in the market that you can use on your e-commerce site. In case you’ve the proper knowledge of coding, then you might be able to do the integrating part on your own. And, in case you’re a non-tech person, then the best option is to hire some professionals and get your payment gateway integrated on your website effortlessly. Things will become much easier if your website is based on PHP.

What are the Benefits of Using Payment Gateway in Modern E-commerce Businesses?

An all-around composed online payment framework expands the leads you get from your web activity. A properly outlined e- business site with a basic and free payment technique will give you an edge over your rivals. It offers a variety of advantages. There are a lot of benefits that you can get by integrating a payment gateway to your website. These are as follows:

1. Centralized Payment System

Having an online payment portal permits you to incorporate all your business payment forms. It gives you a complete diagram of your income. It additionally figures out which payment procedure needs changes so as to give better client benefit, and produce more pay for the business.

2. Availability and Flexibility

The presence of an online payment portal makes things easy for your site regarding online transactions. It helps your site to equip for preparing payments at all times. Thus, your customers can pay from anywhere by choosing their suitable payment option. This improves the relation between you and your customers which is profitable for your business.

3. Lesser Time and Cost Usage

Worrying about preparing payments and managing payment issues can be immoderate and tedious. An online payment framework is equipped for taking care of payment procedures continuously. It doesn’t require extra regulatory help for it to work. This implies less cost of doing business, and more opportunity for you to concentrate on more imperative business matters.

4. Secure Processing

They keep the data of customers secure and also provide protection to merchants from heavy fees. Moreover, they help in preventing dangerous results of getting data compromised.

5. Accept Plastic Money

Payments using credit cards and debit cards are very common these days. Online Payment Gateway is known for making the transactions through credit card easier and efficient because of its batch upload features.

6. Recurring Billing Option

Flexibility and convenience are the USP of online payments. With the recurring billing options of Online Payment Gateway, customers can get receipts of weekly or monthly payments directly sent to their inbox.

7. ACH Payments

Banks are allowed for sending money back and forth electronically by Automated Clearing House (AHC) system. This system helps the merchants to accept ACH payments through Online Payment Gateway.

On the other hand, ensure that your electronic payment framework is completely fit for your site. You can check online for organizations that offer web administrations like web configuration, improvement and even online payment frameworks. Picking the right business site designer to help with your online payment framework is critical. Make sure to look at and get as much data as you can about the support thereby making an educated choice.

PayPal Payment Gateway Integration Using PHP

PayPal is the most popular payment gateway to send and receive payments worldwide. PayPal payment gateway is the easiest option for the web developers to implement a robust payment system on the website.

Once the user clicks on the Buy Now/Payment button, they will be redirected to PayPal where the payment will complete.

After payment completion, the user will be redirected back to the website where the transaction details will be shown to the user. Also, the transaction information would be stored in the MySQL database.

If you interested in PayPal integration, then you can try the easiest way that implies adding a Paypal button to the appropriate place on your website. There are some other approaches too. For example, you can use PayPal SDKs. In particular, PayPal offers REST and NVP/SOAP APIs to help you create a payment solution that completely fulfills your requirements. The NVP/SOAP basically works according to the Adaptive Payment method that helps to transfer money from a system account to a different account along with a note mentioning the name of the person who’s paying.

Some Easy Steps to Follow for PayPal Payment Gateway Integration

In this section, we will be showing the process by which you can integrate PayPal payment gateway using PHP. Follow the steps carefully as given:

  1. Login or Sign Up by clicking on the paypal developer link.
  2. Then, go to Dashboard -> Sandbox -> Accounts and create test accounts for seller and buyer by selecting Business and Personal respectively.
  3. Then, log into the Sandbox business account and go to My Account -> Profile -> My selling tools.

After going to “My selling tools,” copy and paste the payment button HTML code snippet to your website.

Then, Manage Website preferences and turn on “Auto Return” and enter “Return URL”.

Manage Instant payment notifications and select Receive IPN messages (Enabled) and enter Notification URL.

How to integrate PayPal Payment Gateway in PHP?

Now, in this integration procedure, we will be using four files which are given below:

  • index.php: This file has the PayPal payment parameters and “Buy now” button.
  • payment.php: In this part, the IPN listener is present which helps in receiving payment notifications and updates the payment database.
  • thanks.php: This files generally shows success message after completion of transaction.
  • cancel.php: Notifies the user when the payment is canceled.

Know How You Can Send Payment Parameters to PayPal Sandbox

Here, you can find item_name, item_number, amount, currency and more parameters with “Buy now” button. You just have to copy the PayPal button code from My Account> Profile> My selling tools> PayPal buttons. When you click the button, these parameters will be sent to the PayPal Sandbox as mentioned in the form action.

<img src=”camera.jpg” />
<h3>Camera <br> $0.01</h3>
<form action=”” method=”post” target=”_top”>
<input type=’hidden’ name=’business’ value=’Paypal_Business_TestAccount_Id’>
<input type=’hidden’ name=’item_name’ value=’Camera’>
<input type=’hidden’ name=’item_number’ value=’CAM#N1′>
<input type=’hidden’ name=’amount’ value=’0.01′>
<input type=’hidden’ name=’no_shipping’ value=’1′>
<input type=’hidden’ name=’currency_code’ value=’USD’>
<input type=’hidden’ name=’notify_url’ value=’http://SITE NAME/payment.php’>
<input type=’hidden’ name=’cancel_return’ value=’http://SITE NAME/cancel.php’>
<input type=’hidden’ name=’return’ value=’http://SITE NAME/success.php’>
<!– COPY and PASTE Your Button Code –>
<input type=”hidden” name=”cmd” value=”_s-xclick”>
<input type=”hidden” name=”hosted_button_id” value=”### COPY FROM BUTTON CODE ###”>
<input type=”image” src=”” border=”0″ name=”submit” alt=”PayPal – The safer, easier way to pay online!”>

Instant Payment Notification Listener

Here, we have shown an example where payment.php is the IPN listener which receives the payment notification. The IPN listener code samples are available for various languages regarding PayPal payment gateway. In this part, paypal_ipn.php is used and changes have made to update the Payment database.


if (strcmp ($res, “VERIFIED”) == 0) {
// assign posted variables to local variables
$item_name = $_POST[‘item_name’];
$item_number = $_POST[‘item_number’];
$payment_status = $_POST[‘payment_status’];
$payment_amount = $_POST[‘mc_gross’];
$payment_currency = $_POST[‘mc_currency’];
$txn_id = $_POST[‘txn_id’];
$receiver_email = $_POST[‘receiver_email’];
$payer_email = $_POST[‘payer_email’];

$db = new DBController();

// check whether the payment_status is Completed
$isPaymentCompleted = false;
if($payment_status == “Completed”) {
$isPaymentCompleted = true;
// check that txn_id has not been previously processed
$isUniqueTxnId = false;
$result = $db->selectQuery(“SELECT * FROM payments WHERE txn_id = ‘$txn_id'”);
if(empty($result)) {
       $isUniqueTxnId = true;
// check that receiver_email is your PayPal email
// check that payment_amount/payment_currency are correct
if($isPaymentCompleted && $isUniqueTxnId && $payment_amount == “0.01” && $payment_currency == “USD”) {
$payment_id = $db->insertQuery(“INSERT INTO payment(item_number, item_name, payment_status, payment_amount, payment_currency, txn_id) VALUES(‘$item_number’, ‘$item_name’, $payment_status, ‘$payment_amount’, ‘$payment_currency’, ‘$txn_id’)”);
// process payment and mark item as paid.

if(DEBUG == true) {
error_log(date(‘[Y-m-d H:i e] ‘). “Verified IPN: $req “. PHP_EOL, 3, LOG_FILE);


When the IPN listener is set to PayPal, go to My Account> Profile> My selling tools and click on Receive IPN messages which should be enabled. Then, insert the file’s original path as Notification URL.

Before you integrate this feature to your website, remember to check the sandbox several times. Because the PayPal sandbox contains all the functions and services of the PayPal payment gateway that will be tested. So, for online business purposes, it has to provide online payment options. And also, the user should get all the online payment options to choose from available in the market. As it is one of the major payment gateways, you should obviously go for PayPal payment gateway integration using PHP. If you have problems with the integration process, then hire a PHP developer to do the job.

Wrapping it Up….

Well, there are a lot of options from which you need to choose the best payment solutions for your e-commerce website. There is nothing to rediscover when you’re going to integrate a payment gateway for a website. You can go with any payment gateway UAE that is appropriate to your business site. Look for the ready modules to integrate into your site, or even build your own gateway if you’re more creative and integrate such a payment gateway into your website that differs from off-the-shelf offerings. Sometimes, it can be a bit difficult to decide the right one from the available options, but don’t take too much pressure. Consult with the professionals of this field and get the clear cut information you need to make payment integration using PHP hassle-free.


What is payment gateway in PHP?

PayPal payment gateway is an American international e-commerce business organization. It helps to perform money transfer over the internet securely which is considered to be one of the best payment gateway service providers.

How do I add a payment gateway to WordPress?

  • Download the plugin zip file.
  • Log into your WordPress Admin.
  • Click on the “Upload” option, then click “Choose File” to select the zip file from your computer.
  • Activate the plugin.
  • Open the settings page for WooCommerce and click the “Payment Gateways” tab.

How do I set up a PayPal payment gateway?

  1. Log in to Create account.
  2. Click “Shop” from the Top Menu.
  3. Click “Shop Settings” on the left-hand menu.
  4. Click on “Payment Gateways”.
  5. Select the “Add New Gateway” button.
  6. Click on the “PayPal” logo.

Why is payment gateway needed?

People often confuse payment gateways with merchant accounts. But in reality, they both are different things and are required to make online payments. In the merchant account, the funds are held before they are deposited into banks. Basically, its role is to simply decline or approve a transaction.

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