Is mobile payment going too far when cash has become unacceptable?

When mobile payment with smartphones has become the means of choice at retail outlets, the central bank of China needed to remind businesses they should not reject cash payment. In most retail outlets in China, mobile payment with smartphone apps WeChat Pay (of Tencent) and Alipay (of Alibaba) has become the de facto option. Customers with credit or debit cards only, including the cards on UnionPay (China’s clearing platform), are sometimes in bad luck. It turns out even cash payment may not go all the way, which prompted the central bank, People’s Bank of China, to issue a warning notice to the retailers that rejecting cash is against the law.