| 摘要 |
<p>A method for prepayment of a service, comprising the steps of: informing the user of the availability of a plurality of different services; receiving from the user over a first communications link an indication of a desired service and a request for the desired service; providing the requested service to the user over a second communications link; receiving from the user an authentication key to indicate prepayment for the requested service; verifying whether the authentication key is valid, and providing the requested service if the authentication key is valid. <IMAGE></p> |
