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Diagram explaining the System Trace Audit Number (STAN) field in a payment transaction

Merchant & POS

What is a System Trace Audit Number (STAN)?

The System Trace Audit Number (STAN) is a number assigned by the third-party system (ATM or POS) to help uniquely identify a transaction. It is generated in the range 000001 to 999999. Each new authorization message needs a new STAN; retries reuse the original STAN.

Illustration of Third Party Provider (TPP) roles in Open Banking, including PISP and AISP

Payment Institutions & E-Money

What is a Third Party Provider (TPP)?

The term 'Third Party Provider' refers to an authorized online service provider introduced under Open Banking. These are systems outside a customer's relationship with their bank that mediate the transaction. So how many types of third party provider are there? Two.

Old mechanical credit card imprinter machine used to transfer embossed card details onto a sales slip

Merchant & POS

What Is an Imprinter?

An imprinter is the name given to devices that transfer all the information embossed on a credit card onto a paper sales receipt. Before POS terminals, it was commonly used by merchants for authorization transactions.

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.

Illustration representing a foreign currency POS transaction

Payment Systems

What is Foreign Currency POS? What are the key points?

Foreign Currency POS is the POS software that lets merchants process transactions in a foreign currency. Terminals without it can only collect payments in Turkish lira. It comes in two common forms: Multicurrency POS and DCC POS (Dynamic Currency Conversion).

Table listing ISO 8583 Field 25 (POS Condition Code) values

ISO 8583

ISO 8583 Field Descriptions (F25)

F25 - POINT OF SERVICE (POS) CONDITION CODE is the field that defines the condition under which a POS transaction was performed. Possible values include 00 Normal presentment, 01 Customer not present, 02 Unattended terminal, and more.

Diagram showing membership types for Visa and Mastercard card schemes

Credit Card

How Many Types of Membership Are There by Card Scheme?

Banks must go through a costly, arduous process to issue cards (issuer) and accept cards (acquirer), paying high entry fees to international license providers and local organizations such as BKM.

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.