If you pay attention, Alipay, WeChat and other apps will also be highlighted when opening the payment code, which will generally force the highest brightness, especially when the system brightness is low, which will form a strong contrast. The reason for this setting is to improve the visibility of information such as two-dimensional code or bar code of one's own equipment, facilitate the identification and scanning of the other equipment, and improve the accuracy of equipment identification information.
If you think the health code on Alipay is too beautiful, you can actually adjust the light of your phone to prevent it from being too bright, which can also dim the code.