In one embodiment, a method includes providing an application programming interface (API) to an application running on a client system. The API is provided based on a user of the client system being logged in to a social-networking system on the application. A first request is received from the application, and the first request includes a new messaging token and a request to register the new messaging token to a user profile of the user on the social-networking system. A verification token is sent to the application. A second request is received from the application, and the second request includes the verification token and context information of the application. The second request is sent by the application using the API. In response to the received requests, a registration of the user profile is updated by discarding a previously-registered messaging token and registering the new messaging token to the user profile.