Bank warning. Bank card payment stop for 3 days is a warning. The bank will monitor user bank card transactions in real time and set early warning rules based on customers, merchants, transaction channels and other dimensions. Once it is discovered that the customer's bank card has abnormal transactions that touch the "monitoring rules". Immediately issue early warning prompts, conduct risk investigation, take payment stop and other processing measures for risky bank cards, and automatically identify and block fraudulent transactions. This is equivalent to setting an "alarm" on the banking system, but it does not impose too many status restrictions.