To integrate Authorize.net on OpenCart, you can follow these steps:

  1. Log in to your OpenCart admin panel.
  2. Click on “Extensions” in the main menu and then select “Payments” from the drop-down menu.
  3. Find “Authorize.net” in the list of available payment gateways and click the “Install” button.
  4. Once the installation is complete, click the “Edit” button next to the Authorize.net payment method to configure it.
  5. Enter your Authorize.net API Login ID and Transaction Key, which can be found in your Authorize.net account dashboard.
  6. Choose the transaction mode (test or live) and fill in any other required fields, such as the payment gateway title, description, and order status.
  7. Save your changes and test the integration by placing a test order on your website.

That’s it! Once you have completed these steps, your customers will be able to use Authorize.net to make payments on your OpenCart website.