Linking New Email Templates To Pre-Existing Order/Checkout Information

Hi All!

I'm currently working on recreating the email templates using a supported application (Klaviyo).

However, I've encountered templates that link back to the specific items/orders that customers made. For example, the 'draft order invoice' and 'shipping confirmation' both include a button allowing recipients to click to take them back to the checkout webpage with their order loaded up ready to be paid for. I'm curious about how I can incorporate this functionality into the new templates I'm creating.

Any guidance on this would be greatly appreciated!