As its name implies, the IIN is used to identify the card issuer who is issuing its cards through a card network (e.g. You can build your own program to utilize this technique or just buy one that is already available, but either way it is a great way to authenticate card numbers.Įach card number, whether belonging to MasterCard or to some other payments company, begins with an issuer identification number (IIN), which is always six-digit long. Additionally, I will review the MasterCard number format and, for e-commerce merchants, I will show you how to validate the 16-digit account number of every MasterCard credit or debit card that is presented for payment on your website. I will review these card identification features below and will explain how to verify their validity. Every time you accept a MasterCard card for payment, while waiting for the authorization response, you should scan these features and make sure that they have not been altered or tampered with. All valid MasterCard credit and debit cards display a set of unique features that every merchant should be familiar with.
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