Functional cart and payment processor integration needed for a specific theme;

https://themeforest.net/item/fisto-...ries-store-html5-responsive-template/29934331
This is the beauty above, she's taken a good amount of my time up and I'm sad to say I haven't got the skills to finish up with linking carts and checkout...

Have a thread here that explains a bit more about the troubles; https://www.blackhatworld.com/seo/trouble-adding-woocommerce-payment-processors-to-my-php.1342379/

Let me know what can be done, going back to crying while shouting at w3schools...