EPOS System / Plug-In for Woo-Commerce website

This is for Woo-commerce website which sells physical music products (Vinyl, CD, etc), label designs and vintage clothing. Due to the nature of the products sold, this Woo-Commerce site has been customized accordingly. The ePOS system will therefore have to ynchronize seamlessly with the website. I've attached a document the spec which I would look for this ePOS system to provide.