Transaction Matching

A typical card payment transaction generates multiple messages during its life cycle. Messages received via the External Host Interface (EHI) must be linked to the previous messages for that transaction. This matching enables you to track the history of the transaction, compare the financial effect of new messages with previous messages and re-calculate card balances.

Your systems should match new to previous transactions as follows:

Figure: Matching of Transaction Messages Received via EHI

For more information, see the External Host Interface Guide > Transaction Matching.