Wordpress shopping cart with dynamic products plugin

Hi, I need plugin (new or modified existing one if there is any suitable, like WooCommerce) which will connect my custom (php + ajax) cart with Wordpress login system. I have products (dynamically created with php and mysql) which can be added to cart (with ajax), but I need to connect my cart with Wordpress logins (existing ones and/or registered), then checkout and payment gateway. Products are virtual, so there is no delivery options. I was trying to use WooCommerce, but I couldnt force WooCommerce to accept my dynamic products. I like the whole cart system of WooCommerce, but I have dynamic products, which are not supported by this plugin. Later I need to use invoice plugin, so have it in mind, that this will all need to be connected together. Please refer to the attached schema. I can send you my products and cart class files if needed. -- Example of my dynamic products and cart: I sell hats. Different types of hats: cowboy hats, berets, buckets, mini hats etc. (think about them like it is CATEGORY) Each hat can have different color, like: black, red, blue, etc (NAME). Color is being made by the visitor (you can not choose the color, you can only write its name into the edit field). Color could be completely imagined, like "coca-cola-brown". There can be only one unique color name in each category (no two black cowboy hats), but color can be repeated through categories (one black cowboy hat, one black beret). Each category have different price and color doesnt involve the price. All colors of cowboy hats are available at 1$, berets at 2$, etc (PRICE). So visitor is inventing his color, chosing hat type and add it to cart. This is pretty complicated, but I have it already made. I just need the rest, or better - connect it with existing ecommerce Wordpress plugin. So I know who is buying what and I am able to send him an invoice.