1. A method in a telecommunications system, in which at least three parties are involved system's exploitation there, namely: at least one service provider capable of providing services for at least one user, and at least one operator responsible for the operation of the telecommunications system, wherein payable services are delivered to an authorized and authenticated user during a telecommunications session, and in which system each service transaction as well as user are identified, comprising the following steps: performing each transaction according to a transaction flow formed by steps, each step comprising at least one predefined transaction rule which can be affected by at least one attribute, and allowing all of the parties involved to dynamically alter at least by attributes loaded in memory the function of at least one of the rules and/or the execution order of multiple rules for creating a flexible transaction flow to be triggered by a content server or a content request.