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Installing New PayPal module (Latest API 2.0) for osCommerce Version 2.3 Manually

While osCommerce 4.x offers newer features, many shop owners still rely on osCommerce 2 for their online stores. To accommodate this, we have developed a new PayPal module that supports Express and APM (Alternative Payment Method) methods, specifically designed to work seamlessly with osCommerce 2-based systems. In this blog post, we will guide you through the manual installation process of this updated PayPal module.


Step 1: Backing Up Essential Files

Before proceeding with any modifications, it's crucial to back up the following files if you have customized them:

1. admin/modules.php

2. includes/classes/payment.php

To back up these files, you can use the following command if you have SSH access:

tar -cpzf `date +%y%m%d%H%M`_paypal_rest_bk.tar.gz admin/modules.php includes/classes/payment.php

Step 2: Download the New PayPal Module

Download the updated PayPal module from the following link:


Once downloaded, unzip the file to the desired folder on your system.

Step 3: Uploading Files via FTP

Using your preferred FTP client, upload the contents of the new_to_upload folder to the public_html folder of your osCommerce installation.

Additionally, you'll find a to_modify folder containing *_compare.php files for reference and/or comparison tools. Make sure to read the installation instructions provided in the install.txt file.


Step 4: Setting Write Permissions

To ensure proper functionality, set write permissions for the following folders:

1. ext/modules/payment/runtime/logs

2. ext/modules/payment/runtime/auth.cache


Note: Direct access to files in the folders should be denied.

There is appropriate .htaccess file in the runtime folder.

If you have custom web server configuration please update its settings accordingly.


Step 5: Editing Core Files

Now, let's proceed with editing the two core files mentioned earlier: admin/modules.php and includes/classes/payment.php. Refer to the guide provided in the following link for detailed instructions:



Step 6: Setup in the Admin Area

After the installation is complete, it's time to setup the PayPal module in the admin area.

Navigate to the admin section of your osCommerce website and locate the Modules and Payment tabs.

Look for the PayPal Quick Setup button, which will allow you to access the module's configuration settings.


Step 7: Exploring Integration Videos

For a visual guide to the integration process, check out the YouTube playlist below, which demonstrates the new PayPal module's integration with osCommerce 2-based systems:



Congratulations! You've successfully installed the latest PayPal module with API 2.0 for your osCommerce Version 2.3. By following these steps and referring to the provided resources, you can ensure a smooth and secure payment processing experience for your online store. Should you encounter any issues, don't hesitate to explore the documentation or reach out to our support team for further assistance. Happy selling!

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osCommerce 4.x

shopping cart



New PayPal Module (Latest API 2.0)

osCommerce 2.2

osCommerce 2.3

Shopping cart customizations


PayPal Express

APM (Alternative Payment Method)

Standard Variant

Advanced Variant



Front End

Install osCommerce for Me

Let me install myself

Multiple sales channels

Single active sales channel

Installation on your own server

Assigning theme to sales channel

Deleting sales channel


App Shop

Adding Free Module

Admin Area

Adding Paid Module

Installing Module

Opayo Pi Module

Development Mode

Email Verification Before Registration

Managing Languages

Managing phpMussel

Managing Orders

oscommerce.com account

Creating Manual Orders

Managing Customers

Managing Customer Groups

Managing Brands

Managing Categories

Managing Filters on Categories

Managing Products

Managing Stock

Assigning Products and Categories to Front Ends

Assigning and Moving Products to Categories

Managing Default Sort Order on Product Listing and Category

Managing Cross-Sell and UPSell

Managing Reviews

Managing Attributes

Managing Product Groups

Managing Properties

Managing Suppliers

Managing Warehouses

Managing Sales Statistics and Purchase Report

Managing Stocktaking Costs

Managing Deleted Orders

Managing Coupons

Managing Virtual Gift Cards

Managing Sales Price

Managing Giveaways

Managing Featured Products

Managing SEO

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Managing XML Sitemap

Settings of E-commerce Tracking for Google Tag Manager

Setting up GA4

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Assigning Theme to Sales Channels

Deleting Sales Channels

Managing Translations

Managing Email Templates

Managing Catalog Pages

Managing Shipping Modules

Managing Payment Modules

Managing Order Structure

Managing Socials

Managing Extensions

Managing Managers

Managing Access Levels

Managing Back End Menu

Managing Configuration

Mail Sending via SMTP

Setting up SMTP

Status Groups

Order Statuses

Comment Templates

Stock Indication

Notify Me when in Stock

Stock Delivery Terms

Cross Sell Type

Cache Control


Managing Countries

Managing Counties and States