I use Catima for all my points cards. It's very barebones but has handles any card type I've put in. You can get it on official app stores, F-Droid, etc. Best thing, privacy focussed.

https://apt.izzysoft.de/packages/me.hackerchick.catima

Edit: including PC Points.

And the "app only" PC offers can usually be activated through the website.