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Diagram of the EMV Card Block command process

EMV

What is the Card Block command?

The Card Block command is used after card issuance to deactivate all applications within the ICC, including applications that could be selected indirectly. The components of the command are explained below.

Application Unblock command structure diagram

EMV

What is the Application Unblock command?

The Application Unblock command removes the block placed on an application by the Application Block command, making the application usable again. Like Application Block, it is a command sequence managed after the card is presented to the terminal.

Bank card shown in temporarily blocked status before delivery to the customer

Payment Systems

Why Are Cards Printed as Temporarily Blocked Before Being Sent to the Customer?

Cards are delivered to customers by courier, and at several points along that chain a card could theoretically be intercepted. To prevent misuse before delivery, banks print new and Lost/Stolen replacement cards as Temporarily Blocked, activating them only once the customer receives them.

EMV application block command

EMV

What Is the Application Block Command?

The Application Block command is sent to invalidate the selected application on a card after the card has been issued. Unlike Card Block, it can be reversed.

Illustration representing the Card Protection Plan (CPP)

Security

What is CPP (Card Protection Plan)?

Credit cards are one of the most important payment instruments in daily life. As technology advances and mobile payments and ATMs handle nearly all transactions, credit card fraud is also diversifying and increasing.

Illustration representing recurring subscription payments with a credit card

E-commerce

What is Recurring Payment?

Transactions paid at regular intervals can be defined in the system so that only the installment amount blocks the credit card limit; these are called recurring transactions, used for subscriptions or automatic bill payments.

Diagram explaining how a pre-authorization transaction works on a credit card

Merchant & POS

What Is a Pre-Authorization Transaction?

An operation that allows a credit card's limit to be blocked for a period, due to the nature of the product or service sold. Preferred mainly by companies in travel, tourism, and car rental.

Illustration of a phone scam call impersonating a bank

Security

We're Calling From the Bank, Your Account Has Been Compromised...

Fraud cases where scammers pose as bank staff or other institution employees to obtain citizens' banking information have increased significantly recently. Interestingly, the new fraud trend closely mirrors the steps of a genuine banking procedure.

Diagram explaining what an EMV Issuer Script is and how it updates card chip parameters

EMV

What Is an EMV Issuer Script?

An EMV Issuer Script is a system that lets the issuer (the institution that issues the card) update and change the parameters and values on the card chip while it remains in use, reducing fraud over the card's lifetime.

Diagram showing how pre-authorization blocks a card's available limit

Credit Card

Which Cards Can Be Used for Pre-Authorization?

Pre-authorization reduces the merchant's risk by blocking part of the card's limit for a set period. Since a credit card has a defined limit, an amount can be blocked against it. ATM cards and prepaid debit cards have no such limit to block.

PIN try counter on chip cards

Credit Card

What Is the PIN Try Count?

The PIN Try Count is the maximum number of failed offline PIN verifications that can be made with the card. Banks usually keep both the consecutive wrong PIN count and the maximum wrong PIN count.

Diagram illustrating the PIN Change/Unblock command process

EMV

What Is Pin Change/Unblock?

The Pin Change/Unblock command is used after card issuance to let the issuer remove a card's PIN block, or instantly change the reference PIN and remove its block, as well.