Some clients that interface with EMV capable terminals are required to accept Parameter Data Downloads when notified (refer to the  Authorization Platform for more information).

Notification of a Parameter Data Download (PDL) being available for the terminal is returned in the Response Header for the following transactions.

• CreditAccountVerify
• CreditAdditionalAuth
• CreditAuth
• CreditIncrementalAuth
• CreditSale
• DebitSale

The Notification is specifically applicable to the terminal issuing one of the above transactions and will be returned once per day until the download is confirmed using the ParameterDownload service or the flag is reset in the Parameter Data Download system.

Portico allows access to the Parameter Data Download system via the ParameterDownload service. Two options exist in terms of accessing the Parameter Data Download system via the ParameterDownload service:

ParameterDownload Service	Description
Parameter Data Download system interface pass-thru	Portico is totally out of the formatting/processing of the PDL request. Portico receives the ParameterDownload service request and passes the PDL request data (PDLBlockReq) through to the Parameter Data Download system unmodified. The ParameterDownload response message sent to the client contains the requested PDL data (PDLBlockResp).
Parameter Data Download system interface partially abstracted	This option allows for a portion of the PDL request to be abstracted (e.g., defined by XML).

Portico receives the Parameter Data Download service request and derives the block to be sent to the Parameter Data Download system based on the request data (PDLRequest) received. This allows the use of XML data elements for defining the query and determining the contents of the response. 

The ParameterDownload response message sent to the client contains the requested PDL data (PDLResponse).

Regardless of the method utilized to obtain PDL responses, the data returned will be in the form of table blocks (see Table Definitions below).