Installing the what3words OpenCart Extension
The OpenCart Extension enables you to add a field to your checkout page that can accept 3 word addresses and provide autosuggest results as a user types.
The Add-in can be used in OpenCart 3.X
Download the OpenCart here.
Upload the file to your store within the OpenCart admin portal using the Extension Installer.
Once installed, “what3words” Extension will appear under the “Modules” in the Module List. Enable the module and add your API Key for the field to appear on your checkout page.