Enable API:
By default API is disabled. To enable the API, you need to locate Control Panel (admin) settings -> system section and enable API. If you want to restrict public access with secret key you can save it in settings. This key will need to be provided with every API request.
On live sites use API key.
Download API script
https://github.com/abantecart/testing_tools
You can copy this script to your own installation main directory.
How To Test API.
To make development with AbanteCart API and testing easier we have created a script to help you see how API works. These script includes most of the features and provides examples.
http://demo.abantecart.com/test_api.php
You need to enable API in the demo admin. Demo is reset every 30 min, so you need to reactivate.