The European Payments Council defines SEPA by means of a Credit Transfer Scheme Rulebook with the current version being 3.2
The SEPA CT Rulebook defines 3 Core Payments Clearing & Settlement messages and 2 Payments Initiation messages
UNIFI, which stands for UNIversal Financial Industry message scheme is an International Standard (ISO 20022) and was chosen as the base for SEPA due to it providing the financial industry with a common platform for the development of messages in a standardized XML syntax.
Embracing a standardized XML syntax and utilizing a modelling methodology based on UML has provided SEPA with a syntax-independent means for enabling financial business transactions and associated message flows.
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