Examples
Bearing each of the above four positions in mind, an MTI will completely specify what a message should do, and how it is to be transmitted around the network. Unfortunately, not all ISO 8583 implementations interpret the meaning of an MTI in the same way. However, a few MTIs are relatively standard:
| MTI | Meaning | Usage |
|---|---|---|
| 0100 | Authorization request | Request from a point-of-sale terminal for authorization for a cardholder purchase |
| 0110 | Issuer Response | Issuer response to a point-of-sale terminal for authorization for a cardholder purchase |
| 0120 | Authorization Advice | When the Point of Sale device breaks down and you have to sign a voucher |
| 0121 | Authorisation Advice Repeat | if the advice times out |
| 0130 | Issuer Response to Authorization Advice | Confirmation of receipt of authorization advice |
| 0200 | Acquirer Financial Request | Request for funds, typically from an ATM or pinned point-of-sale device |
| 0210 | Issuer Response to Financial Request | Issuer response to request for funds |
| 0220 | Acquirer Financial Advice | e.g. Checkout at a hotel. Used to complete transaction initiated with authorization request |
| 0221 | Acquirer Financial Advice repeat | if the advice times out |
| 0230 | Issuer Response to Financial Advice | Confirmation of receipt of financial advice |
| 0400 | Acquirer Reversal Request | Reverses a transaction |
| 0420 | Acquirer Reversal Advice | Advises that a reversal has taken place |
| 0421 | Acquirer Reversal Advice Repeat Message | if the reversal times out |
| 0430 | Issuer Reversal Response | Confirmation of receipt of reversal advice |
| 0800 | Network Management Request | Echo test, logon, log off etc. |
| 0810 | Network Management Response | Echo test, logon, log off etc. |
| 0820 | Network Management Advice | Keychange |
Read more about this topic: ISO 8583, Message Type Indicator
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