Need help implementing Phoca Cart with Joomla 5, Gantry 5, and Smart Slider / Paid Assistance

[dwdtox]

Hello good people,

I am having a major issue implementing Phoca Cart on my Joomla 5 website.

My setup:
Joomla version: 5.4.1
Template: Spirit Pro (v2.0.10)
Framework: Gantry 5.6.1

What I have done so far:
I have already created individual product pages for my 8 products. Each product has its own separate page containing images, descriptions, and a "related products" section. Everything was built using the Smart Slider Joomla extension, where I used multiple sliders placed one below the other on each page.

What I need from Phoca Cart:
Since the product presentation (images, description, price) is completely handled by Smart Slider, I only need to place an "Add to Cart" button on these custom product pages.

Ideally, when a user clicks "Add to Cart", a popup/modal should appear asking them to either "Continue Shopping" or "Go to Cart".

If they choose "Continue Shopping", they should stay on the same page and be able to browse other products.

If they choose "Go to Cart", it should take them to a new page where they can complete a Guest Checkout (without creating an account) by just entering their Name, Address, Phone Number, and selecting a Payment Method.

The issue I'm facing:
I have already set up the category and products inside the Phoca Cart component, and I created a new menu item. However, when I try to insert the Phoca Cart module inside a Custom Module on my product page, it only displays the product image and title. Clicking any link leads to a completely blank page.

Furthermore, I added the cart to my main menu (named "View cart - checkout"), but clicking it just redirects me back to the homepage.

I assume I need to configure something specific within the Gantry 5 template and its Outlines, but I don't know exactly what to do.

Paid Help:
If anyone can help me troubleshoot this and get it working flawlessly, I am more than happy to pay for your time via PayPal (price to be agreed upon).

Thank you in advance!
Dacha