In Hangzhou, you can use the "Alipay" app to make in-store payments, pay for public transportation (public bus, subway, and taxi), rent public bicycles, purchase bus and train tickets, make check-outs on most Chinese-based websites, etc. It can also be used to pay social security rates, medical insurance rates, education fees, and utility bills such as water and electricity online.
Reservations are required to visit most scenic spots in Hangzhou. Please make a reservation in advance online before you go.