How do you know if the other party has seen it when Alipay sends a message?

After Alipay sends a message, it doesn't display the read function like a nail, so how does Alipay know whether the other party has read it?

How do you know if the other party has seen it when Alipay sends a message? Alipay can't know if the other party has read it. Unless the whispering function is used, the other party will completely delete the information after reading it. The specific operation steps are as follows:

1. Open Alipay and select the friend you want to whisper in the message interface.

2. Click the+button in the chat interface, and then select Whisper.

This paper takes opporeno6 as an example, which is suitable for the version of Alipay V11.3 system.