China UnionPay Express failed to display the bank verification code information. The first possibility is that you entered the wrong verification code, which is basically the case. The second possibility is that the verification code input exceeds the specified input time, and the verification information of the short message cannot pass. This may be due to the data exchange time between China UnionPay Express and the bank, or the customer may have delayed the time.

China UnionPay Express Sign failed for the following reasons: ① The mobile phone NFC is not sensitive. Some people are not sensitive to the NFC chip of their mobile phones, and some people are not sensitive to the thick cover of their mobile phones. ② The NFC of ②②POS machine is not sensitive. Some of their POS machines have weak NFC hardware signals, and some people have installed password keyboard covers to prevent voyeurism, which makes POS flash payment insensitive. After the password cover is removed, POS will be very sensitive after flash payment. ③ When flash payment is made, the NFC position of the mobile phone does not correspond to the correct POS position.