Integrate osCommerce and Merchant One Gateway

Trexle connects osCommerce to Merchant One Gateway and 100+ other payment gateways using a single plugin for one time annual fee

Merchant One Gateway and osCommerce Integration Guide

You need to obtain API Login ID = your account name and Transaction Key = your account password from Merchant One Payment Gateway.

Once you have these to credentials you can either use the sandbox mode for testing or live mode for production on your site.


Take the credentials you just obtained from Merchant One Gateway and navigate to Trexle dashboard, click Payments Gateways and select Merchant One Gateway from the drop down menu as shown below.

Fill into your Merchant One Gateway credential and click Add Gateway. Click the Activate button next to Merchant One Gateway, and it will give you a success message and the button will turn into green. You should see something like below.

To integrate Merchant One Gateway and osCommerce you need Trexle API keys

How to install Trexle extension to osCommerce


  1. Log in to your osCommerce admin panel

  1. On the left menu in the Admin panel, click on the ‘Modules’ tab

  1. Under the ‘Modules’ tab, click on the link ‘Payment’ and then on the button ‘Install Module’

  1. Find the ‘Trexle’ extension after clicking on the ‘Install Module’

  1. Click on ‘Trexle’ and then on the ‘Install Module’ button

  1. Trexle plugin should now be successfully installed

To ensure the integration works seamlessly, create a test product, logout from your admin session and perform a checkout as a regular customer.

Here is a video tutorial on both installation and order testing.

Transaction Testing Account
Transactions can be tested using one of two methods. First, transactions can be submitted to any merchant account that is in test mode. Keep in mind that if an account is in test mode, all valid credit cards will be approved but no charges will actually be processed.
The Payment Gateway demo account can also be used for testing at any time. Please use the following username and password for testing with this account:
Username: demo
Password: password

Transaction POST URL
All transactions should be submitted to the following URL:
This URL is the same for both Live and Test Mode environments.

Test Transaction Information
Test transactions can be submitted with the following information:
Visa 4111111111111111
MasterCard 5431111111111111
DiscoverCard 6011601160116611
American Express 341111111111111
Credit Card Expiration: 10/10
Amount > 1.00

Merchant One Gateway Supported Countries

Merchant One Gateway Supported Payment Processing Actions

✔ Purchase
✔ Authorize
✔ Capture
✔ Void
✔ Credit
✔ Recurring
✔ Card Store

Key Features

Credit Card Vault: securely store your customers sensitive credit card data using tokens.
Instant PCI-DSS Compliance: your customers credit card data never touches your site or server.
Multiple Gateway Support: Connect your osCommerce site to 100+ payment gateway

About Trexle

Trexle is a powerful online recurring subscription billing platform that integrate Merchant One Gateway and other +100 payment gateways with osCommerce and other dozen of e-commerce platforms.

About Merchant One Gateway

Merchant One is a direct processor who combines cutting edge technology with exceptional service to provide you with the best solutions for your merchant processing needs. They have been in business for over 12 years and proudly service tens of thousands of merchants across the country.

About osCommerce

Being in the fintech business for 18 years, osCommerce platform enables merchants to create their very own online store and start selling products and services to customers worldwide. The tools they offer to merchant owners are free, available under Open Source license. osCommerce also has a large community of store owners, developers, and service providers who help each other during the many stages of maintaining an online business.