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For a manual keyed transaction, the card number is not correct.
When the clerk receives a time out error, they should attempt the transaction a second time from the same invoice.
Your processor must have duplicate transaction checking turned on. When a duplicate transaction is sent (same invoice number and card number) and the processor returns Duplicate Transaction the clerk is presented with 3 options. Option 1 is the option the clerk should accept most of the time.
Duplicate transactions are usually the result of a time out error. If a transaction response is not received after a few minutes, the system will send the transaction a second time. Either the request was lost or the response was lost. If the request was lost, the processor will process the transaction. If the response was lost and the transaction was approved already, the processor will respond with “Duplicate Transaction” and return the approval information.
Duplicate transactions can be avoided by making sure you have a stable internet connection, that you are not using wireless networks. If you are having internet issues, test your internet with a web browser, not by attempting to process transactions. If you are using terminal services, ensure that you are using the remote POS device manager, not redirecting serial ports.
If a timeout occurs between System Five and the remote POS device manager (cloud and terminal services), the remote pos device manager will also buffer the last transaction response. If a second identical request is made from System Five, the remote POS device manager will respond with the last response.
The datacap logs can help diagnose some issues.