Inquiry: How to redirect guest users to a custom registration page instead of the Joomla default?

Dear Gridbox Support Team,

I am currently using Gridbox for my website and I have a specific requirement regarding the user registration flow.

I have already disabled "Guest Checkout" in the shopping cart settings because I want all customers to register or log in before completing a purchase. However, instead of using the default Joomla registration page, I would like to redirect all unregistered guests to a specific custom page I’ve designed.

The destination URL for unregistered users should be: https://magicweb.tw/checkout-page.html

To help you understand my current setup and the issue I’m facing, I have recorded a short screen capture here: Video Link: https://jmp.sh/b0sX38HB

My questions are:

How can I configure Gridbox so that when a guest clicks the "Buy" or "Checkout" button, they are automatically sent to my custom URL instead of the system default registration page?

Is there a specific setting in the Gridbox Store or a way to override the redirect logic for unauthorized visitors?

I want to ensure a consistent brand experience for my customers and would prefer they only see my custom-designed page.

Looking forward to your guidance.

Best regards,

JAMES