Integrate OpenCart and Usaepay

Trexle connects OpenCart to Usaepay and 100+ other payment gateways using a single plugin for one time annual fee

Usaepay and OpenCart Integration Guide

To integrate USAePay, you will need the following credentials: API key and PIN.

To obtain these credentials, log to your USAePay Merchant portal.

From your home page, click on “Settings” in the menu. In the sub menu, press “API Keys

Press the “Add API key” button

On the API Keys Editor page:

Add a Name for your website

A PIN is required for integration, even though USAePay’s interface states it’s optional.

Add your store’s email to the “Email Merchant Receipt To” textarea

Press “Apply” to save the settings and stay on the editor page. Your key will be displayed.

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

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

To integrate Usaepay and OpenCart you need Trexle API keys

Trexle extension can be installed to your OpenCart store in two ways:

1st method

Download Trexle – OpenCart extension from Trexle GitHub repository

Go to your OpenCart admin panel, navigate to Extensions -> Extension Installer.
Then click the blue Upload button and provide the route to the Trexle extension you’ve just downloaded.


Click the blue Continue button. If successful, you should get a green “Success: You have installed your extension!” message.

2nd method

Go to your OpenCart Admin panel and then open the Extensions menu. You will see OpenCart Marketplace


Enter ‘Trexle’ in the search field and click on the Trexle extension displayed in the search results.

Click on the ‘Download’ tab and then on the ‘Install’ button.

Wait for the progress bar to notify you of the successful installation of the Trexle extension.

Finally, create a test product, logout from your admin session and test the customer checkout.


  • Exp/date – any future date
    CVV code – any

Usaepay Supported Countries

Usaepay 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 OpenCart site to 100+ payment gateway

About Trexle

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

About Usaepay

USAePay is a payment gateway that provides U.S. merchants the ability to accept credit cards easily, safely and securely online. By connecting their shop to USAePay gateway, processing system, online merchants ensure seamless onsite checkout experience for their customers.

About OpenCart

OpenCart is one of the most popular and reliable open source e-commerce platforms for online shops. It is known for an extensive number of features and user-friendly interface and is very convenient solution for shop owners who are lunching their online business for the first time.