The demo site now has an example of displaying Etsy listings within a WordPress page: https://advanced-etsy-widget.com/use-in-page.html
Just released Advanced Etsy WordPress Widget v2.0 which includes Grid Layout Mode - really looks great! Check it out - https://advanced-etsy-widget.com
Advanced Etsy WordPress Widget is a smart and easy-to-install WordPress widget that allows you to display your Etsy Shop Listings on your WordPress website.