If you get an "....... invalid image ID" error and you are using WooCommerce with installed the W3TC plugin, don't worry, this simple guide will help you to sort this problem in just a couple of clicks.
Open your WooCommerce admin panel and click on "Performance" menu on the left bar and then on "Database Cache" menu voice.
Then scroll down till "Never cache the following pages:" field and paste this value inside /wp-json/wc/v3/*
Now click on Save settings & purge cache
Done, try sync again your ApiDrop products and everything will be fine.