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Electronic fee collection. Requirements for pre-payment systems Ingestion-build-89079 Ultrasonic tests often are performed1 Scope This technical report (TR) analyses requirements for a universal Pre Pay account system for EFC including the following issues: relations to other existing standards in this domain; the core requirements and functionality that must be provided. This technical report will show an analysis of the requirements for a universal prepay system and categorise possible different types of pre pay solutions, in terms of functionality, technical and legal