I see Shopify are now trying to force people to download an app (probably to scrape personal data), rather than simply providing a tracking number. The app is called 'shop', which is obviously a word that's not easy to search for without just getting... shops.
I can't find a way to actually get a tracking number out of the URL. I had to use an online QR code reader to even get the URL alone, since it wanted me to just scan it with my phone. No thanks!
None of this is necessary or wanted.