I would assume it’s per-device, derived from the public key of the keypair in the secure element, so shouldn’t change.
Works for me…
I wish that made sense. I really do.
All setup for me
took 1 minute to setyp 
I got TestFlight and it works
Satisfying 

Would be nice if my card had the Alpha tag on it 
I’m back to thinking it could be iOS beta then.
On Beta as well 
For what it’s worth, I added my card to Apple Wallet ok (not running iOS beta) but then couldn’t add to my Watch… 
Darn it!
I’m outta ideas. I’ll see what the chaps have to say on the chat.
I am on 11.4 latest Dev and my watch is on 4.1 lastest dev also and Apple Pay is on both and I am on testflight
How to set-up Apple Pay and Q&As -
Yaaaaaaaaaaaaay! Thanks, Monzo! 
Now we all just need to find something else to complain about…
Got my card added alright today works a treat 
Now we’ve had an official announcement, I think an explanation on what’s taken so long and why all the secrecy would give some closure.
I believe Apple don’t allow in-app provisioning on a beta app.
Official announcement
confirmed 


You sly dog, got there before me.