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Illustration explaining the authorization process for card payments at POS, virtual POS, and ATM terminals

Merchant & POS

What is Authorization?

The term 'provizyon' comes from French and means obtaining approval for a transaction. In payment systems, authorization confirms that the card, POS, bank account, and transaction limits are sufficient to complete a payment.

Illustration representing Merchant Category Code classification for card transactions

Merchant & POS

What Does a Restricted/Prohibited MCC Mean?

The MCC code, or Merchant Category Code, is a 4-digit code used to classify merchants. Some MCC codes are restricted or prohibited, and POS terminals or card transactions may be blocked when such a code is used.

Illustration representing the advantages and disadvantages of credit cards

Credit Card

What Are the Advantages and Disadvantages of a Credit Card?

Credit cards can be a convenient way to manage income and expenses, but for those who don't know how to use them, they can become an expensive and risky product. Here are the key pros and cons to weigh before applying for one.

Diagram of the online authorization flow for below-CVM-limit contactless transactions

Payment Systems

Domestic Flow Change Made for Below-CVM-Limit Online Contactless Transactions

The domestic authorization flow for below-CVM-limit online contactless transactions has changed. Issuers can now ask the cardholder for a PIN or request card insertion instead of simply approving or declining. This post explains the CVM list and the new DE48 PDS22 and DE39 = 65 message flows.

EMV upper consecutive offline limit

Merchant & POS

What Is the Upper Consecutive Offline Limit?

The Upper Consecutive Offline Limit is the maximum number of consecutive offline transactions allowed by the issuer's chip card application on a terminal that cannot go online. It is held in tag 9F23.

Person reporting a stolen credit card to their bank

Credit Card

What should I do if my card is stolen?

If your card has been stolen: call your card's bank and close it with a Stolen status, check for transactions you don't recognize and dispute them, and update any automatic payment instructions tied to the old card.

Diagram showing the flow of incoming and outgoing files in the clearing system between banks

Clearing

Clearing System Files: Incoming and Outgoing Files

The clearing system settles a transaction between two participants when a card from one bank is used at another bank's POS or ATM. Learn about the incoming and outgoing files used in interbank clearing.

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...

Credit card being inserted into a merchant POS terminal

Credit Card

What Is the Transaction Life Cycle in the Card World?

As credit cards become more and more a part of our lives, we now make almost all our purchases without cash. We inserted our card into the merchant's POS. We made a 100 TRY sale transaction. We received a receipt confirming it was successful.

Table of chargeback reason codes by payment scheme

Chargeback

What Are the Chargeback Reason Codes by Payment Scheme?

A chargeback is the process of requesting that an amount paid by credit card be refunded, either because the goods or services paid for were not received, or because a transaction is identified as one the cardholder did not carry out.