In China mobile payments rule, you are more likely to be denied using cash Han mobile payments like Alipay or we pay, even the beggars on the streets use we pay here these days.
Even out in the most rural areas mobile payments are preferred.
Taxi, public transport, malls, food markets and even high fashion brands they all accept and prefer Alipay or wechat.
In my daily life I never use cash these days in China, and I mean never. I exclusively use wepay or Alipay
NOTE how we on your UNIONPAY question, that a UNIONPAY card issued outside of China might not be accepted in China, even if it is issues by a chinese bank outside of China, most places n China accept foreign cards but there are still many that don’t and that sometimes includes foreign UNIONPAY cards.
So do not assume that your UNIONPAY card will work if issued outside of China.