During more recent certifications, several processors (such as Paymentech:Tampa) added a new requirement for purchase cards and amex transactions. A destination zip code must now be provided for those transaction types.

In order to accommodate, without needing customers to change their integrations, we've added a set of fallbacks, here's the priority.

1. ShipZip transaction parameter
2. Zip transaction parameter (AVS)
3. ZipCode merchant parameter

The quickest solution, in most cases, would be to add the ZipCode merchant parameter to the account (using the Monetra Administrator, just edit the account and you'll see the new field).