Interac rules require tracking the location of any PIN Entry Device (PED) used to process debit transactions. To facilitate this, the PED serial number should be sent in the SerialNbr field in the Header for any Canadian debit transaction request. 

The PED serial number may also be used as an alternate method for Interac transaction security, instead of Voltage encryption or the Message Authentication Code (MAC). Special host setting configuration is required, contact your Heartland representative for assistance.

See the Device Configuration Complex Type in the Portico Schema. Applicable to Canadian merchants only.