How many health codes can you show me?

Four.

Health codes can be handled by family members in Alipay, with a maximum of 4 health codes.

The specific way for Alipay to apply for the health green code is to open Alipay, search for the health code in the top search box, pop up the health code of each region, select the health code of your own location, and then fill in the information according to the prompts to successfully receive it.