Which law did you violate by not accepting cash?

It is illegal to refuse to accept cash. No unit or individual may refuse to pay all public or private debts in People's Republic of China (PRC) in RMB. If you refuse, it is illegal. Anyone who encounters rejection can complain to the competent RMB authority, namely the People's Bank of China. On the other hand, as an operator, it is also suspected of infringing on the rights and interests of consumers. Consumers have the right to choose the payment method, as long as the currency is legally circulated. Rejecting a certain version of paper money is an infringement on consumers' right to choose. Not accepting cash violates the provisions of the Regulations on the Administration of RMB and the People's Bank Law. According to the Regulations on the Administration of RMB, RMB is the legal tender in China, which can be used to pay all public and private debts in China, and no unit or individual may refuse to accept it. Renminbi is the legal tender of the country, including paper money and coins. Rejection actually challenges the status of legal tender. Mobile payment and smart money are actually supplements to legal tender, and they cannot replace legal tender, nor can they reduce their application scenarios. If the merchant happens to have no change, it is another matter, but the merchant refuses to accept paper money under the condition of conditional acceptance and asks for mobile payment, which violates the RMB management regulations. At present, China's laws only stipulate the illegal nature of rejecting RMB, but there are no specific punishment measures, and there are few penalties for such acts in judicial practice. Only penalties such as damage and imitation are stipulated, and there are no specific penalties for refusal and contempt.

Legal basis: Regulations of People's Republic of China (PRC) Municipality on the Administration of Renminbi.

Article 3 The legal tender of People's Republic of China (PRC) is RMB. No unit or individual may refuse to pay all public or private debts in People's Republic of China (PRC) in RMB.

Article 6 All units and individuals should cherish RMB. It is forbidden to damage the RMB and hinder its circulation.