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Close-up of a credit card, illustrating a transaction pending in open authorization

Merchant & POS

Can an Open-Authorization Transaction Be Cancelled?

Open authorization covers the period between authorization, POS batch close, the bank's end-of-day process, and clearing. Learn which steps allow cancellation versus refund, and what a cardholder should do.

Diagram illustrating the structure of an ISO 8583 message field

ISO 8583

ISO 8583 Field Descriptions (F41)

F41 - CARD ACCEPTOR TERMINAL IDENTIFICATION: the terminal where a transaction took place. An 8-character alphanumeric value generated by the acquirer bank and assigned to the POS, managed as a unique terminal number at the acquirer.

Z Report printout from a cash register

Merchant & POS

What is a Z Report?

A Z Report is a report taken at the end of the business day, bearing a sequential number, that gives detailed information about sales made using a cash register during a business day, the revenue earned, and the VAT collected.

Diagram showing how an open authorization moves to a card statement after batch close and clearing

Credit Card

What Is an Open Authorization?

In credit card transactions made through a POS, receiving approval alone is not enough for the transaction to post to the card's statement period; settlement must also take place. The settlement period, known as the open-authorization waiting time, varies by transaction type.

POS terminal software version update process diagram

Merchant & POS

How is a software version uploaded to a POS terminal?

To upload a version to a POS, the software on the POS and the authorization system on the bank side must support it. Version upload to a POS can be done manually on the device itself, or via a remote upload request.

Illustration showing different card printing methods

Credit Card

What Are the Card Printing Types?

While it is true that, with technological advancement, the trend of using payment transactions without a physical card via mobile phones has increased, there are many reasons why cards are still physically printed and delivered to customers.

Illustration representing communication protocols used in POS payment systems

Merchant & POS

What Are POS Sub-Protocols and Their Use Cases in Turkey?

In payment systems, every exchange between POS devices and bank or payment institution systems runs on a specific messaging standard, generally based on ISO 8583. However, each country, bank, or switch network defines its own version of this standard.

Diagram illustrating TCR (Transaction Record Component) packets used in payment clearing and settlement files

Payment Systems

What Is TCR (Transaction Record Component)?

TCR stands for Transaction Record Component, the packets that carry transaction information in a clearing system. Transaction types in a clearing file are distinguished by transaction code and usage code values, and this data is sent inside TCR packets.

Credit card statement showing an unrecognized transaction

Credit Card

Is Your Card Making Purchases Without Your Knowledge?

While reviewing your credit card statement, you suddenly notice a transaction you never made. What would you think? Is your card going shopping while you sleep? Let's look at how this can happen and what to do about it.

Illustration showing the difference between a cancellation and a refund transaction

Merchant & POS

What Is a Cancellation (Void) and a Refund?

Credit card transactions made via POS sometimes need to be reversed. These are called a cancellation (void) or a refund. What's the difference, and when does each apply?

Illustration representing electronic payment systems

Payment Systems

What are Payment Systems?

Let's talk about payment systems, which we have heard more about since the internet entered our lives, and the basic structures behind them. The first credit card in the world was used in America in the 1920s.