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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.

Illustration of a card payment approved for a partial amount

Merchant & POS

What Is Partial Authorization?

Partial Authorization lets an issuer approve part of a transaction instead of declining it when the balance or limit is insufficient. This post covers how it works in ISO 8583, whether it is mandatory, and why it matters for the business.

Contactless NFC payment on an iPhone opened to third-party apps by Apple

Payment Systems

Apple opens NFC payments to third-party apps

Under the EU Digital Markets Act, Apple will let third-party developers in the European Economic Area offer NFC contactless payments inside iOS apps without Apple Pay or Apple Wallet, opening the way for banks and payment services to launch their own tap-to-pay solutions.

Diagram illustrating how financing companies operate in Turkey

Payment System Institutions

What Are the Financing Companies Operating in Turkey?

These are credit institutions providing financing to individuals and companies for purchasing goods and services. Financing companies specialize mainly in vehicle loans, offering fast and flexible point-of-sale solutions distinct from banks.

TR QR Code supported payment devices

Payment Systems

Which Devices Can I Pay From With the TR QR Code?

According to BKM's TR QR Code Technical Principles and Rules Guide for card payments, QR code payment structures apply to EFTPOS, shared EFTPOS, ÖKC, ATMs, payment provider apps, static QR codes and virtual POS.

Diagram of an Onus installment transaction flow between POS and HOST

Payment Systems

What are the key points in an Onus Installment project?

Before describing the Onus Installment process, it is better to first answer: what is an Onus transaction? An Onus transaction is when the acquirer and issuer are the same institution, so the transaction is processed through that institution.

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).

Key clauses to review in business contracts

Payment Systems

Key Points in Contracts

“What do contracts have to do with us? Let the legal department handle them,” you might say. But legal teams can't know every specialty, so business teams are expected to help with the clauses that affect their decisions.

Payment terminal running multiple bank applications as a shared POS

Payment Systems

What is a shared POS? Key points for projects and testing

A shared POS is a bank or institution terminal that can host more than one application. This post covers the software, APN and authorization steps, and the key test scenarios to cover in a shared POS project.