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Diagram of the Shared POS Management System (OPYS)

Merchant & POS

What Is the Shared POS Management System (OPYS)?

Developed by BKM and made available to banks, OPYS centrally supports setting up multi-application POS terminals shared by multiple members, inviting other members, adding or removing them, and managing field company relationships.

Diagram illustrating how netting works between two banks in the clearing system

Clearing

What Is Netting in the Clearing System?

In payment systems, a transaction made at a merchant or ATM with a card issued by a different bank becomes subject to clearing. Netting offsets each participant's receivables and payables from these transactions into a single balance.

Illustration representing a payment card's transaction history

Credit Card

What Is a Card's First Transaction Date? What Is It Used For?

Banks generally keep a record in the system of a card's "First Transaction Date." This information is automatically populated by the online authorization system. So under what circumstances is it updated? First, an authorization transaction must…

Illustration of the compliance process between merchant bank and issuer in card payments

Chargeback

What Is Compliance (Regulatory Compliance)?

Compliance means adherence to card scheme rules. Outside chargebacks, it is how a bank that loses money because card payment organization rules were broken recovers that amount from the party that caused the loss.

Google Card, the physical payment card Google is reportedly preparing to rival Apple Card

Credit Card

Meet the Google Card!

After Apple Card, announced last March to great fanfare, Huawei said it would issue a card too. Google has now joined the race among tech companies by announcing a new card of its own.

POS terminal used for card payment transactions

Merchant & POS

What is On-Us Leakage?

On-Us Leakage is a term used in the world of payment systems. On-us means the card-issuing bank and the POS-acquiring bank are the same. So what does on-us leakage mean in this context?

Zone Working Key PIN encryption between banks

HSM & Security

What Is ZWK (Zone Working Key)?

ZWK stands for Zone Working Key. It encrypts the PIN so that it can travel securely between different financial institutions, such as the acquiring bank and the issuing bank.

Exterior of the Takasbank headquarters building

Payment Systems

What is Takasbank?

Takasbank (Istanbul Settlement and Custody Bank) exists to increase the competitiveness of Turkey's markets by providing clearing and custody services, financial services, and other economic activities under the relevant legislation.