Messages

Messages

ISO specifications define a number of messages. Each Message represents a specific ISO853 functionality within the payment space like Authorization, Sale, Reversal, Refund, Network etc.

Within ISOSim, a message simply represents a set of fields applicable to a ISO8583 message. In most cases, a message has a request and a response leg with differening fields (for example, Action Code (F39) and Approval Code (F38) are generally applicable for response legs only).

Within ISOsim, for simplicity, we use the same message to represent both the request and response legs. You could define separate messages to represent request and response legs, like 1100 and 1110 for example.