With the popularity of mobile payment in China, payment through Alipay, WeChat's payment code have become commonplace for most people.
But sometimes when the mobile network is not good, or even no network, we can still successfully complete the payment by presenting the payment code. Do you know the reason?
Today, Lenovo China provided an explaination.
For mobile payment platforms like WeChat and Alipay, which actually equip every user with a dedicated identifier. The name is Seed Data. It is as unique as our real life ID card.
If you open the payment code to pay when there is no network, it can generate an offline code, which can help us to complete the payment process, so it can also be called offline payment.
How is an offline code generated?
When there is no network on the phone, the recognition system of WeChat and Alipay will generate a QR code based on the set algorithm, seed data and time, and other factors.
This QR code is used for offline payments and it is the offline code.
When the merchant scans the payment code, the scanning device such as a code gun will verify the offline code through the relevant algorithm.
If it is verified that the offline code comes from the consumer's mobile phone, then the payment process can be confirmed and completed immediately.
The offline code will be identified according to the user's identity, and is one-time, every 60 seconds will be updated, so the offline code also has a great security.
Nowadays, many smartwatches rely on a similar principle, enabling users to present the payment code through the watch without a mobile phone.
