The ACK transaction is used to confirm that the response was successfully received and the transaction should be considered as COMPLETED.
The ACK transaction result can be true or false. If you receive “false”, you can try to send the ACK transaction again for 2 more times. If the result is still “false”, consider the transaction as NOT successful.
| Field | Mandatory? |
|---|---|
| CompanyNumber | Y |
| MerchantNumber | Y |
| TransactionNumber | Y |
| Field | Mandatory? |
|---|---|
| returnCode | Y |