Still not sure what caused this glitch (likely SafetyNet failure during Magisk setup).
Anyway, I found in Google Pay, Contactless setup
View attachment 5630005
the Last item said 'Your phone
does not meet the security requirements'.
Clearing Google Pay data wouldn't fix.
I am scared to clear data for the several components that appear in applist w/ 'security' as keyword... So next I cleared Google Play Services and Google Play Store data, but now Google Play wouldn't even open, just this (unending):
View attachment 5630011
Strangely, clearing Google Pay data again had no effect either...
Next, I simply uninstalled Google Pay completely, then reinstalled it from Play Store, and now get 'Your phone meets he security requirements' as shown above. Also:
View attachment 5630017
so seems I'm good to go again!
I don't know if version changed, but I assume I had latest version before as I auto-update... Some things are a mystery, but Uninstalling and reinstalling did the trick for me where clearing data wouldn't...
For others facing this, clearly you'll need to fix any SafetyNet issues first...
Hope this might alay some anguish.

PW