What's the matter that customers can't receive short messages when they scan the code online?

The reason for the pressure is that the payment notice of online customers is not displayed. The working principle is that while transferring money, the system platform sends you a text message. The mobile phone number and content of the sender of the short message can be set by himself, which has nothing to do with the bank account number, and may not be the same person. It is not the actual arrival notice, so it can't be found, and it may be delayed.