The NACK transaction is used to indicate to PayFacto host to perform a reversal of a previously approved transaction. \\
The NACK transaction must be sent within 3 minutes otherwise the automatic reversal process will take place on PayFacto host.
The NACK result can be “True” or “false”.
| Field | Mandatory? |
|---|---|
| CompanyNumber | Y |
| MerchantNumber | Y |
| TransactionNumber | Y |
| Field | Mandatory? |
|---|---|
| returnCode | Y |