go say hi to a billion and a half people and a 3-5000 year old civilization. China is almost entirely cashless and has been for several years now: you scan a QR code or the vendor scans your payment code, and money is deducted from your balance or Chinese bank account.
thing is, getting a chinese bank account/card is a huge pain in the butt, not technically difficult but time-consuming and functionally non-essential but insisted upon.
Now, you don't need to waste your time. Connect your own no-fee credit card and pay through the national systems without any fees!
transportation, hotels, hostels, grocery stores, massages, basically everything in the country is now open to anyone with a credit card instead of requiring a Chinese bank account.
Wechat promoted this "overseas card function" for years but it didn't work for the entire time I lived in China, and I still couldn't connect my no-fee credit card last year when I visited.
Sometime in the last year, however, foreign credit cards have actually been integrated into the national payment systems. This is huge, especially since so many countries now have 10-day visa-free travel in china.
Now, you can connect a no-fee card to Weixin(wechat) and for the first time, don't need a Chinese bank account, phone number or card to use your local card to pay for thins in China! This is a pretty big payment revolution for travelers interested in visiting China and traveling around without undue hassle.
Every vendor has a qr code on the wall or a little scanner, so you look for the wechat or alipay symbol, scan the qr code or they scan your qr code and, done.
important notes(official regs):
Sign up with a passport and no-fee debit or credit card. You can sign up with any card, but if you have tx fees then the charges will rack up way too fast to be of any use.
No minimum transaction amount - i bought a single beer yesterday for 83 cents
No transaction fees under 200 RMB($26 USD equivalent) although you can pay multiple times, so if the bill is 340 RMB, you can pay 200 + 140 in two separate transactions.
Roughly $10000 USD yearly limit, which is more than enough to pay for a year of living in China, and way more than enough for a vacation.
It's made this trip wayyy easier than before, where I was one of the very few cash-using people in the country because I didn't want to deal with the time-suck of reactivating my Chinese bank account.
I'm going to go buy snacks and stuff.