For eligible merchants processing on the GSAP-NA or GSAP-AP Authorization Platforms, Portico supports the option to allow a Merchant Category Code (MCC) to be specified in a credit transaction request that is different from the value stored for the DeviceId.

A MCC value can be sent in the request header to override the MCC value defined for the DeviceId; this value will be passed in the host request message, and used to format any MCC-specified fields.  This should be sent on primary transactions only.  Any secondary transaction or transaction performed using a previous transaction id will use the MCC from the original transaction.