Accessing Window object on Checkout UI - Checkout URL

Hey guys!
Currently developing several apps for a Checkout UI migration that we are doing.

I’m trying to get the Checkout URL within my Extensions in order to load some query parameters that are on the url.
Seems like there’s currently no way for us to get the window object inside our checkout components (prob because of server side rendering?)

Is there another way for me to get the Checkout URL?

Thank you in advance!