They're good questions, but I think they're answered by the point that Apple Pay Cash is US-only. The service is just Apple's abstraction of Green Dot [1] branded prepaid reloadable VISA cards. If it's US only, Apple doesn't need to worry about the international corner cases yet.
Thank you, I missed that point. I guess it's understandable given the environment but still I wish Apple would have gone for something more ambitious like the original Apple Pay.
