A system and method for provisioning a push notification session via a communications network between an application on a client terminal and a server corresponding to the application. In one aspect, a push provisioning entity transmits a message to the client terminal, whereby to configure the client terminal into a state in which it is able to request a push notification session with the server. An application on the client terminal can then request establishment of a push notification session by transmitting a push notification session request message to the push provisioning entity. The push provisioning entity generates a token for use in validating the push notification session, associates the generated token with the application and transmits the token to the application, which uses it to establish the push notification session.