Alipay
I like getting payments sorted before arriving in China, so there’s one less thing to work out on the first day. Register with your mobile number, then open Me → Bank Cards to add an eligible international card.
Alipay setup guidanceWeChat / Weixin Pay
I’d set up WeChat Pay as well, so there’s another payment option ready to go. In WeChat, open Me → Services → Wallet → Bank Cards and follow the prompts to link an eligible card.
WeChat Pay setup guidanceComplete any identity checks requested in the apps, keep access to your verification texts, and check card eligibility and fees before paying. Carry a backup payment option. These are official information links, not affiliate links.