Merchant & POS
Don't Dismiss the POS Receipt
In daily credit card purchases, the POS produces two receipts: the Customer Copy and the Merchant Copy. The cardholder gets the customer copy; the merchant keeps its own copy by law.
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Payment Systems
Visa Overseas Contactless Transactions – After Code 70 (Part 2)
After switching to response code 70 for contactless limit-exceeded cases, we found that some overseas POS devices and acquirers did not handle it as expected. This post covers why the problem lies in the ecosystem and how to address it.
ATM
15 Interesting Facts About ATMs
Although we can now carry out almost all branch transactions at an ATM, for most of us an ATM is still just a machine for depositing and withdrawing cash. Today, without a card, we can use our phones to deposit and withdraw cash via QR code.
Fraud
What is Fraud? What are the Types of Fraud?
With the growth of credit and debit card usage and rising e-commerce transaction volumes, there has been a serious increase in exploiting user negligence to harm customers. Fraud means using someone else's card at a merchant or ATM to gain unjust profit.
HSM & Security
Types of Symmetric Keys
In the world of payment systems, keys and their uses are important for transferring information from one place to another, storing information, and securing authorization and scripting steps. Key types are divided into six categories based on their purpose.
ISO 8583
ISO 8583 Field Descriptions (F22)
F22 - POINT OF SERVICE ENTRY MODE: This field holds how the transaction was performed via the POS/ATM and the PIN entry capability of the POS device. The first 2 digits show how the transaction was performed, and the last digit (shown as x) carries the POS's PIN entry capability. Numeric...
Payment Systems
Why Am I Getting an Error When I Try to Pay with a TR QR Code?
In payment or cash withdrawal transactions, the TR QR Code is generated by the POS or ATM. The card issuing bank must build its systems to read and act on this code. Errors usually stem from mishandling the long and short QR code flows, which are explained here.
Contactless
Contactless Transaction Limit Raised to 350 TL
The no-PIN limit for contactless payments has been raised from 250 TL to 350 TL. Contactless payments up to 350 TL can be made without a PIN; above that, they are made contactless with a PIN.
Merchant & POS
What Does First Online Transaction Mean?
In payment systems, an online transaction means the transaction is sent to the card or POS/ATM bank at the moment it occurs, and required checks are obtained from that system. So does every transaction happen online? Of course not. Especially with contactless...
Online & Authorization
What are EMV Tags?
In EMV, data is stored in Tag-Length-Value (TLV) format, and it is carried between the card, the POS terminal, and the authorization system in this same format. This post lists every EMV Tag, its type, and its description.
Merchant & POS
What Happens During Authorization?
Today, credit cards play an important role in our daily lives. We can carry out almost all of our transactions without carrying cash, using our credit card instead. During a purchase, we hand our card to the cashier and enter our PIN at the POS terminal.
ATM
Not-on-Us (Another Bank's Card at Our ATM): An Interesting Situation in the Transaction
Did you know that when a transaction is attempted with another bank's card at an ATM, the PIN check happens not when the card is inserted, but when the transaction is sent for authorization? (Deposits are the exception.)