There may be a transmission error due to system communication. CCB's system has received the application for this transaction and completed the payment, but the merchant fails to receive this feedback or will prompt failure after timeout. Generally, this transaction will be automatically reversed, that is, the system will immediately reverse the transaction, indicating that the money has not been brushed out. The landlord can pay again and check the credit card details in a few days. In case the transaction fails to be recorded, you can also call their 400 customer service phone number and ask someone to explain that the transaction failed at that time, and the trade union will help you handle the adjustment.