In one embodiment, a method includes one or more computing devices of a proxy server, in response to receiving a message from a token reader, generating a federated session token in relation to the message and sending a request for federated access to social-networking information of a first user of a social-networking system, where the request contains the federated session token. The method also includes one or more computing devices of the social-networking system, in response to receiving the request for federated access, validating the request based at least in part on one or more configuration settings associated with the first user and establishing a federated access session with the proxy server. The method also includes one or more computing devices of the proxy server, retrieving, by the federated access session, the social-networking information of the first user from the social-networking system.