Cross TID Duplicate Checking logic checks for duplicate transactions submitted by any device under the same SiteId. The base matching criteria used in the duplicate check consists of the following criteria:

• Portico service used
• Cardholder Primary Account Number
• Transaction amount

If a transaction is submitted that matched a previously “Approved” transaction based on the above criteria and is within 10 minutes, then a response code/message of “02 - Transaction was rejected because it is a duplicate.” is returned in the response.

When enabled, the DeviceId where the original transaction is found will be returned in OriginalDeviceId in AdditionalDuplicateData in the header of the transaction response.

Please note that enabling this service may not be appropriate for all merchant configurations.  If a merchant has a large number of Device Ids, this can impact processing time.