A method for authenticating a third-party application for enabling access to messaging functionalities, including: receiving a first application launching request for an establishment of a connection between the first application and a server, wherein the connection enables a set of messaging functionalities that reside at the server and that are available for implementation by a second application to be available for implementation by the first application; validating that the first application is allowed to access the set of messaging functionalities at the server, wherein the validating includes: sending an indication of the first application launching request, to the server; and receiving an authentication token from the server, wherein the authentication token is configured for providing an authentication pass to the server when delivered thereto by the first application, thereby allowing the first application access to the set of messaging functionalities; and delivering the authentication token to the first application.