What is included in the header of a transaction message?

The header of a transaction message plays a crucial role in ensuring that the information contained within that message is processed correctly and efficiently. It typically includes metadata that is vital for directing the message to the right destination within the network. This can involve routing information, identification of the transaction type, timestamps, and other relevant data that helps in the proper handling of the transaction.

By providing this information, the header facilitates effective communication between different systems, enabling transactions to be processed without errors. It ensures that messages reach their intended recipients in the electronic payment ecosystem. This is essential for maintaining accurate records and ensuring that transactions are completed successfully and securely.

In contrast, the other options do not accurately reflect what is found in the header. Detailed settings for online transactions pertain to configuration parameters but are not part of the message header itself. Data regarding individual user identities might be included in the payload of the message rather than the header. Similarly, layouts for physical store operations are unrelated to the electronic transaction messages and would not be found in this context.