Now it's the era of mobile payment, but smartphones are all dependent on the Internet. So, if the Internet is suddenly disconnected or the phone is in arrears during payment, can the payment be completed? In fact, Alipay and WeChat have long considered this issue and have launched the function of "offline payment". Through this function, even if there is no network, the mobile phone can still complete the payment under certain conditions. You can turn on your mobile phone and start the flight mode. At this time, the mobile phone must be in a disconnected state, and then open Alipay or WeChat and select the "payment code" function. If there is no accident, the payment code can be displayed normally. At this time, you can still complete the payment normally by scanning the QR code on your mobile phone with the code scanner in the supermarket.

This is because the payment code function of Alipay and WeChat does not depend on the mobile phone network, and the mobile phone is only responsible for generating a payment code for payment according to your account number and other identity authentication information. As long as the code-scanning gun itself is in the networked state, it can still complete a series of operations such as code scanning and payment normally. In this state, the server of Alipay and WeChat will receive the payment code information submitted by the scanner to the server. As long as this payment code is consistent with the information stored in Alipay and WeChat databases, the background server will automatically complete the payment, and the mobile phone does not need to participate in this process. When the network of the mobile phone is restored, you will receive the message that the deduction was successful. In fact, this function is very similar to the credit card commonly used in the past. We know that the credit card itself has no network function, but the payment can still be completed when swiping the card. This is because the credit card itself only needs to provide a payment ID, and other operations are completed by the merchant's POS and the bank's server.

Another situation is to brush the QR code of WeChat and Alipay when taking the bus. Because the bus is moving at any time, the code scanner itself will not be connected to the internet. At this time, if the mobile phone is also disconnected from the internet, the code scanner will record the QR code of the mobile phone separately, and the deduction will be completed uniformly when the bus travels to the terminal, even at night. Therefore, sometimes when you brush the QR code on the bus, you will not receive the deduction information immediately, but you will have to wait for several hours, and even you will be prompted to deduct it at night. This is because the bus code scanner is not on-line in real time, but by recording the code scanning information in batches, first accounting, and then centralized deduction.

of course, "offline payment" is only applicable to payment scenarios such as supermarkets, restaurants, public transportation, etc. If it is necessary to scan the code for payment, then the payment cannot be completed without the network. Because in the process of code scanning, it is definitely necessary to obtain the account information of the other party through the network. Therefore, when you go out, you'd better take one or two hundred dollars with you to avoid the embarrassing situation that you can't pay without the internet.