A METHOD AND A CORRESPONDING PROXY SERVER, SYSTEM, COMPUTER-READABLE STORAGE MEDIUM AND COMPUTER PROGRAM

摘要

A METHOD AND A CORRESPONDING PROXY SERVER, SYSTEM, COMPUTER-READABLE STORAGE MEDIUM AND COMPUTER PROGRAM 10 Various embodiments provide a method comprising receiving a request message at a proxy server, the request message relating to a transaction between a first client and a second client, the request message comprising first client data and second client data, the first client data identifying an account to be used by the first client in the transaction, 15 the second client data indicating if the second client is subscribed to a service; determining if the second client is subscribed to the service based on the second client data at the proxy server; generating an authentication request message at the proxy server if it is determined that the second client is not subscribed to the service, the authentication request message requesting confirmation that a holder of the account is 20 the first client; sending the authentication request message from the proxy server to an external server; and receiving an authentication response message from the external server at the proxy server in response to sending the authentication request message, the authentication response message comprising an indication of whether the holder of the account is the first client. 25 FIG 1