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Diagram explaining the PAN Sequence Number (PSN) field on a chip card

Credit Card

What Is PSN (PAN Sequence Number)?

A 2-character field written to the card's chip data that increases by 1 with each card renewal, allowing authorization to distinguish between the old and new card. This means that, theoretically, assuming no other conditions prevent it, a...

Card skimming and copied card details

Credit Card

What Should I Do If My Card Details Are Copied?

Card copying usually happens with magnetic stripe debit cards. As soon as you notice your card details have been copied, you can close the card, renew it or change its PIN.

Comparison chart showing the differences between CVV and CVV2 security codes

Credit Card

What Is the Difference Between CVV and CVV2?

CVV (CVC) and CVV2 (CVC2) are two terms that cardholders often confuse. Both are used for verification in card transactions, but there are notable differences between them, such as where each is printed and which transactions use it.

Close-up of a bank card's chip failing to be read by a POS terminal

Credit Card

What should I do if my card's chip isn't reading?

If your card's chip won't read, the chip data is likely corrupted or the POS's chip reader is faulty. This is usually caused by magnetic interaction with another card's chip.

Illustration explaining how a card's CVV value is generated

Credit Card

How is CVV generated?

CVV is a very critical 3-digit value used during a card's authorization process. The CVV value is encoded in the card's magnetic stripe data (Track 1 and Track 2). Is it generated by an algorithm or chosen at random?

Close-up photo of a cracked payment card

Credit Card

My Card Is Broken. What Should I Do?

If your card is broken, call your bank's Customer Contact Center to request a renewal. Since the card number usually stays the same after renewal, this is convenient for you. If you'll keep using the card, don't set it to Closed or Cancelled status.

Diagram illustrating ISO 8583 field F23, the card sequence number

ISO 8583

ISO 8583 Field Descriptions (F23)

F23 - CARD SEQUENCE NUMBER: Information used to distinguish cards sharing the same card number. For example, the Card Sequence Number is incremented by 1 when a card is renewed. In an authorization transaction, if the F22 value is '05x'...

Expiration date printed on the front of a payment card

Credit Card

What Is a Card Expiration Date?

What is a card expiration date? Learn why banks print this date on every card, how it's used in purchases, and what happens once it passes.

Credit card expiration date printed on the front of a card

Credit Card

What Is Effective Date?

The Effective Date is the information showing the date until which a card can be actively used. It can also be called the expiration date. It is a mandatory field printed on the card and used in transactions, set by banks for card security.

Diagram illustrating the properties and lifecycle of a tokenized card number as it moves through the payment network

HCE

What Are the Characteristics of a Tokenized Card Number?

A tokenized card number replaces a physical card number so transactions can be carried out securely. It is generated by the TSP (Token Service Provider), used by the cardholder or merchant, and travels across the payment systems network.

Istanbulkart transit and payment card

Credit Card

Istanbulkart: Both Transit Card and Payment Card

When I think back to the Akbil I used when I first arrived in Istanbul, I think it's fair to say that Istanbulkart has undergone a very significant transformation. Users can now track activity, top up and view balances right from their phones.