1. Some people transferred money by mistake. When others use online banking to transfer money, they fill in the wrong bank card number, which leads to the wrong transfer.

2. Red envelopes issued by merchants: After some e-commerce or software apps bind bank cards to participate in an activity, the event organizer will send the previously promised red envelopes to users in the form of transfer. Transfer test, when conducting a transfer test, the bank card will inexplicably receive 1 cent.