If the message is...	Your system should...
An authorization decisioning message	Return the required authorization decision within the processing window.
An authorization repeat	Match to the original authorization and return the same logical response when possible.
An authorization advice	Match to the original authorization when possible and update transaction records, blocks, balances, or reconciliation status.
An authorization reversal	Match to the original authorization and release or adjust the previous authorization block.
A financial / presentment message	Match to the related authorization when possible, release related blocks, and post or reconcile the final transaction.
A financial reversal	Match to the prior financial notification and reverse or adjust the previous posted financial impact.
A chargeback	Update dispute, ledger, transaction history, and reconciliation records.
A chargeback reversal	Match to the original chargeback when possible and reverse or adjust the chargeback-related impact.
A duplicate or retry	Return the same logical response as the original processing and avoid duplicate impact.
A cut-off message	Process using CutOffId and return Cut_OffResult.
An unmatched message	Store the message and route it to reconciliation or exception handling.