What is the role of a header in a message or batch of transactions?

The role of a header in a message or batch of transactions is crucial in guiding the message to the correct destination. The header typically contains important metadata about the transaction, such as sender and receiver information, timestamps, and identifiers that ensure the message is routed appropriately through the processing system. This guidance is essential in payment processing, where accuracy and timely delivery of information are critical.

The information in the header helps systems differentiate between various types of transactions, prioritize processing, and manage workflow effectively. For instance, in a batch of transactions, the header ensures that each transaction is recognized and correctly routed to its intended processing platform.

While encryption is essential for securing the content of messages, that is not the primary function of the header. Similarly, storing messages permanently or executing transactions are functions that occur at different stages in the processing pipeline and not directly related to the purpose of the header.