Illegal, the so-called "fourth-party payment" platform refers to a large number of registered merchants or personal accounts, relying on regular third-party payment platforms such as Alipay and Tenpay, without obtaining a national payment and settlement license, violating the national payment and settlement system and illegally building payment channels. By setting up a so-called network technology company, criminals cover up the fact of illegally obtaining citizens' personal information in the name of operating Internet access and related services. At the same time, members of criminal gangs buy and sell "four-piece sets" such as bank cards, ID cards, mobile phone cards and U shields through the Internet, and then sell them to criminals at home and abroad at high prices, making illegal profits.

Interpretation of Several Issues Concerning the Application of Laws in Handling Criminal Cases of Illegal Fund Payment and Settlement and Illegal Trading of Foreign Exchange According to the Measures for Payment and Settlement of Foreign Exchange of the People's Bank of China, payment and settlement refers to the monetary payment and fund settlement behavior of units and individuals in social and economic activities by means of bills, credit cards, remittance, collection and acceptance, and entrusted collection. The bank is the intermediary of payment settlement and fund settlement. Non-bank financial institutions and other units without the approval of the People's Bank of China shall not engage in payment and settlement business as intermediaries, except as otherwise provided by laws and administrative regulations. The State Council's Measures for Banning Illegal Financial Institutions and Illegal Financial Business Activities (implemented on July 1998) stipulates that no unit or individual may set up financial institutions or engage in financial business activities without the approval of the People's Bank of China. The Criminal Law Amendment (VII) further revised and improved the crime of illegal business operation stipulated in Article 225 of the Criminal Law, stipulating that those who illegally engage in the payment and settlement of funds and disrupt the market order shall be deemed as the crime of illegal business operation.