I'm working on a project which we need to handle iso8583 messages, I'm not much sure about the difference between authorization request and authorization advice request why these are implemented and what are the use cases of these messages, thank you
1 Answers
Both messages are very similar over the wire, but represent different things. The authorization is a request from the client (POS, ATM, etc.) to authorize a transaction and lock funds. The advice is a notification sent by the client about something that already happened.
In the old days where a POS might not have a proper connection to the host, the operator could for instance call an authorization center by phone in order to get an approval number and then enter an OFFLINE transaction in the POS. That transaction is later sent by the POS as an "advice" to the host so that it gets included in the transaction batch.
In a gas pump transaction, you may send an authorization for say USD 100, then after the user fills its tank, the pump will send an "advice" for say USD 25 (the actual amount), releasing USD 75 from the locked funds.
Hope those examples helps.
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