The best description will be if I describe all functionalities that this extension can do.
You can connect plugin with REST API and/or WebAPI
You can easily add infinity count of settings (apps), for example if you have 3 accounts on allegro, you can add all to plugin
You can get your or somebody else auctions from allegro to WordPress.
You can show them as widget and/or as shortcode on page/post, to do it you just need to add some code (ex. [gjmaa id=”5″ count=”10″ show_price=”0″ show_time=”0″ show_comments=”0″ count_of_comments=”5″ /])
Do you have WooCommerce? Awesome!
You can import auctions from allegro as products
Importer only add new products
Autosync Stock of products ( you need to run cron on your server )
Autosync Price of products (you can enable price update to sync between allegro and your WooCommerce)