Paying
Alipay
Bind a card at home. No mainland bank account.
WeChat Pay
WeChat, then Weixin Pay inside it.
Finding traveler-friendly Mini Programs in WeChat
Translate inside Mini Programs; inbound UX is improving.
TenPayGo — pay Weixin merchants without binding inside WeChat
Sign up with email. Add an international bank card, Apple Pay, or a supported overseas e-wallet. Then pay at merchants that accept Weixin Pay.
Cards and cash
Carry all three tracks.
Foreign-card fees
What wallet apps charge on foreign cards, and ways to pay less.
When a payment fails
Try the other wallet, then a card or cash.