Duplicate Transaction Checking

Duplicate transaction checking, if enabled, will reject approved transactions that have the same credit card number, expiration date, amount and order id within a specified time frame. Duplicate transaction checking does not apply to declined or gateway rejected transactions. By default, duplicate transaction checking is enabled with a 30 second time frame on all accounts. We enable this by default in order to reduce the fees merchants would be charged for duplicate transactions, as well as to reduce possible customer complaints caused by duplicate transactions being issued.

Merchants can disable duplicate transaction checking and adjust the time frame by selecting "Processing" in the control panel.