Try this:
I created it using qrencode as follows:
$ qrencode -o qrnz.png 'https://3dmapapp.nz/map?lat=-43.57&lon=170.22&zoom=12'
That is a universal link for my app "3D Map New Zealand". On my phone where the app is installed, if I view the code with the camera, it opens the app. Assuming that you're not one of the about 4 people who have ever bought the app, maybe it will open the App Store for you (let me know!).
Topic:
App & System Services
SubTopic:
General
Tags: