Blocking mode, also known as Negative Acknowledgment (NAK) for UETR recycling validation, is a crucial concept in the realm of financial transactions. UETR, which stands for Unique End-to-End Transaction Reference, is a globally recognized identifier that ensures the traceability and integrity of financial messages. UETR recycling validation refers to the process of validating the uniqueness of a UETR within a specific timeframe. In this context, blocking mode comes into play as a mechanism to prevent the reuse of a UETR within a defined period. When a financial institution or payment service provider receives a transaction message, it verifies the UETR … Continue reading What is meant by Blocking mode (NAK) for UETR recycling validation?