What is the problem that the mobile phone dynamic password entered by China Postal Savings Bank during online banking payment is invalid?

Hello, use the dynamic password received by the personal online bank of China Postal Savings Bank to conduct online payment transactions. If the time is too long, the password will exceed the service period; SMS password will be invalid after one attempt; When the customer has not received the SMS password for a long time, he can click "click to resend" or "click to ask customer service to inform the mobile phone of the dynamic password" to obtain the SMS verification code again, and the initially received SMS password will also be invalid; I hope my answer is helpful to you.