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Electronic Commerce Indicator (ECI). The ECI value is part of the 2 data elements that indicate the transaction was processed electronically. This should be passed on the authorization transaction to the Gateway/Processor.
string"MASTERCARD_NON_3D_SECURE_TRANSACTION", "MASTERCARD_ATTEMPTED_AUTHENTICATION_TRANSACTION", "MASTERCARD_FULLY_AUTHENTICATED_TRANSACTION", "FULLY_AUTHENTICATED_TRANSACTION", "ATTEMPTED_AUTHENTICATION_TRANSACTION", "NON_3D_SECURE_TRANSACTION"