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In general, the Refund Service can be performed without reference to an original transaction.

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Refund Reference Data may be identical to the Reference Data of the original Service, but this is not mandatory and not checked. Refund Reference Data is not used to retrieve the transaction data of the original Service, but it is stored in the transaction data base database for the Refund, and provided to HAP for inclusion in the Auth/Clearing messages. Initialised Initialized to " " (empty string) during Service Initialisation and set through an Additional_Transaction_Data_Event for the Refund Service.

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• Add Tag DF59 to nexofast.h

• In nexoFAST_serviceInitialisation initialize tag, to ““.

• set through an Additional_Transaction_Data_Event for the Refund Service. (how to set it?)

• Do we just put the original service being refunded as the refund reference data? (did i understand correctly)?

• Do we need to configure this tag in atheos?

• What is our scap and hap? (a small encapsulation)