1. A computerized method for authenticating user service requests, comprising: transmitting, from a server, data that causes transmission of a service request to the server; receiving, at the server, data representing the service request and data representing a sender of the service request; comparing, by the server, (a) the data representing the service request, the data representing the sender of the service request, or both, against (b) pre-defined criteria associated with the data that causes transmission of the service request; and processing, by the server, the service request from the sender if the comparison authenticates the service request.