Identifier acquisition method and device, equipment and medium

The invention relates to an identifier acquisition method and device, equipment and a medium. The application management end sends a first user identifier, registered in the main application client, of a target user corresponding to user information carried by an identity verification request to the main application client under the condition that the identity token carried by the received identity verification request of the main application client passes verification; the main application client can send the first user identifier and the identity token to the micro application client, so that the micro application client can send an identifier acquisition request carrying the first user identifier and the identity token to the micro application client; and the application management end acquires a second user identifier corresponding to the first user identifier in the micro-application client under the condition that the identity token in the identifier acquisition request passes verification, and sends the second user identifier to the micro-application client so as to realize connection between the main application and the micro-application user system. Therefore, the main application and the micro application can realize data sharing based on the opened user system.