If you are after a reviews set up, then Wix Stores do their own ratings and reviews tutorial.
https://support.wix.com/en/article/corvid-adding-ratings-and-reviews-to-a-wix-stores-site
Or another method by FutureCode.
https://futurevisionweb.wixsite.com/futurecodemain/reviews
https://www.youtube.com/watch?v=PQha8zxEaJ8 - youtube video of above tutorial page.
If you are looking at creating your own URL, then have a look at these previous posts.
https://www.wix.com/corvid/forum/community-discussion/dynamically-add-url-parameters-to-external-url
https://www.wix.com/corvid/forum/community-discussion/url-parameters
https://www.wix.com/corvid/forum/community-discussion/passing-parameters-in-url
You will then need to get that variable URL onto say a triggered email that gets sent out automatically after the purchase to a set members email address.
Or just use emailUser in the backend and send a triggered email with those three variable values.
https://www.wix.com/corvid/reference/wix-users-backend.html#emailUser
it must be done through the backend as then it can send to a specific member, through the frontend emailUser will only send to the currently logged in user.
Finally, if the required URL is already set up at the end of the order and you don’t need to add anything, rather just grab it so to speak, then you can just use Wix Location and the URL function to get the current URL.
https://www.wix.com/corvid/reference/wix-location.html#url