TRANSACTION AUTHENTICATION

摘要

In a transaction authorisation arrangement a sales point (1) (an electronic point of sale device or a vending machine, for example) communicates with a transaction application (2) transmitting thereto a transaction value. The telephony platform (3) reserves one of a series of premium rate numbers (5) which can be dialled up by a mobile telephone user to authorise the charging of the transaction against the telephone bill. When a call is received at th e premium rate number the telephony platform notifies the transaction application which then authorises the sale.