I asked about Apple Pay in this thread:
I've got one of my credit cards signed up for it, but because that's basically my "Costco only" card I haven't even used Apple Pay yet. My main hope was to use it in Quanlian / PxMart, but it'll only work there with a couple of banks' credit cards, not mine.
My wife is using 街口 and loves it. She's signed me up too but I've yet to use it.