After sharing the android app WeChat successfully, how can we obtain the OpenId of WeChat users who click on the link through the shared link?

  android, question

An app has access to WeChat’s function of sharing friends (open platform). After successfully sharing a link, how can a shared friend obtain the openId of the friend’s micro signal when opening the link? Ask the great god for advice.

WeChat cannot recall such important data as friend openId to third-party users. Besides, not every micro-signal has an openId, and only when it is connected to an open platform can there be an openId. Therefore, I estimate that the data the subject wants to take is uid, which is also impossible.