Submission method for Woocommerce plugin

I am attempting to setup a parts catalog with WooCommerce. I need to know what submission method Woocommerce uses so I can give this piece of information to the third party catalog provider. The question is whether or not it’s a GET, POST or AJAX method that is used. I cannot find this in the WooCommerce documentation.

Since it’s a add to cart functionality I am aiming for, I would think it’s not a GET method that would allow to add parts to a cart for checkout. Rather it’s a GET or AJAX, but not certain which it is or how the WooCommerce cart really works.

Can you help me, thank you.