Yeah! The repo will go public in ~5-10 days from now or so. We want to do some fixes and cleanup first.
It does cycle between random designs - but because of the absurd level of popularity, we had to add some pretty aggressive caching settings. This means it randomizes every ~5 minutes instead of every refresh. Pagination, filters, and a list of "most recent" as well as "most popular" patterns are all coming soon, as well!
AC uses "data" type QR codes, which are not supported by most QR reading/writing libraries. We are using a significantly edited/tweaked version of the ZXing QR library, ported to TypeScript. You can find our modified version here:
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The pro designs furthermore use multi-part QR codes, which are supported by almost no libraries at all. We had to add that support, and it's in the same repo.
Regarding your bug report: transparency generally only shows in-game when placed on the ground or as face paint. And the NSO application doesn't show it correctly, but it should work in-game just fine.