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 the premium rate number the telephony platform notifies the transaction application which then authorises the sale.