...

UniPayGateway

February 12, 2015
Written by
James Davis
Written by James Davis
Senior Technical Writer at United Thinkers

Author of the Paylosophy blog, a veteran writer, and a stock analyst with extensive knowledge and experience in the financial services industry that allows me to cover the latest payment industry news, developments, and insights. Read more

Reviewed by
Kathrine Pensatori
Product Specialist at United Thinkers

Product specialist with more than 10 years of experience in the Payment Processing Industry. I help payment facilitators and PSPs solve their various payment processing issues. Read more

EMV Integration-Related Logic

In view of the approaching transition to mandatory support of EMV standard by US merchants, it is important for payment gateway software developers to understand the key features they need to add to their products to be able to make perform EMV integrations as smoothly as possible. Particularly, the EMV integration-related logic must include the functionality for exchange of data between a chip card, a terminal, and a gateway/processor. EMV standard is much more complicated than the one used in ordinary swipe credit cards.

Several Necessary Fields

There are several necessary fields, which have to be present in the request, when a transaction is submitted to the issuer. These fields include tag data from the chip and a set of fields, related to terminal’s EMV capabilities, card entry mode, etc.  Just like a request, a response message must also include some mandatory fields. It should be stressed, that integrity of the outgoing data is ensured by special cryptograms, attached to request and response, respectively.

Finally, there is a list of mandatory fields, which must be printed on a receipt. Particularly, this requirement is intended to make the functioning of the system, which prints the receipt, more visible and transparent for developers. The common mandatory fields include application name, application PAN, card entry mode, transaction total, cardholder verification, authorization mode, and EMV tag data.

More information on host EMV integrations can be found in the respective article “Peculiarities of host EMV integrations” at Paylosophy.

Useful articles to help you: