One way of preventing duplicates is using Restrictions
The Restrictions tab is found under the individual terminal settings. Restrictions can be enabled for duplicate transaction detection and limiting refund transactions.
Duplicate Status is used to enable or disable duplicate checking. The default is “Unrestricted,” which performs no checks. “Deny All” enables duplicate checking and will reject duplicate transactions once the specified threshold has been reached. The merchant has the option to have duplicate checking calculated from "Approved Only" transactions (default) or "All Transactions."
A duplicate is defined as transactions with the same:
- Transaction Type
- Credit Card Number
Duplicate Time (Minutes)
“Duplicate Time” is the time frame configured for duplicates to be detected and rejected. For example, a five minute time value would detect duplicate transactions made within the last five minutes (of when a transaction is processed).
“Maximum Duplications” is the amount of duplicate transactions that are allowed within the specified time frame before the feature will reject subsequent duplicate transactions.
“Refund Status” is used to enable or disable refund volume checking. Default is “Unrestricted,” which performs no checks. “Volume” enables the feature and will prevent Refunds once the specified configuration has been met.
Once the “Volume” option is selected, the "Maximum Refund Count" and the "Maximum Refund Amount" interact with each other. Once one of the limitations have been met, no more refund transactions will be allowed.
For example, if the "Maximum Refund Count" was set to 10 and the "Maximum Refund Amount" to $1000, the first limit reached within the last 24 hours will block any other refunds. If you had one refund of $1000, no additional refunds would be possible, and if you had 11 refunds of $50 each, the the eleventh would be rejected, even if the $500 limit had not been reached yet.
Maximum Refund Count
Maximum Refund Count is the number of refunds that may be processed within a 24 hour period.
Maximum Refund Amount
The maximum refund amount is the maximum total dollar amount of refund transactions allowed to be processed.
The merchant has the option to have the refund limitation calculated from "Approved Only" transactions (default) or "All Transactions."