When checking your site, my coder understands your mean is that The other 3rd party already has its own shipping and order tracking method. Now the seller (website owner) delivers the goods to the carrier (3rd party) and then receives a tracking page (the order tracking page provided by the carrier) the seller will send the tracking page link to the buyer through the buyer's email is done.
With each WooCommerce order, there is full information of the buyer, the seller just needs to send the tracking page link via email or phone of the buyer.
https://prnt.sc/YrA2aDaNtpcG
So pls let me know if you don't understand it. Thank you!