Merchant & POS
What is CAVV? What is AAV?
CAVV and AAV are verification codes used in 3D Secure transactions to ensure transaction integrity and security. CAVV is used by Visa, while AAV is used by Mastercard.
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ISO 8583
What Fields Make Up ISO 8583?
We covered the ISO 8583 basics in an earlier article. This post explains the ISO 8583 message structure in detail: every ISO 8583 message consists of three main parts - the MTI (Message Type Indicator), the Bitmap, and the Data Elements.
Payment Systems
What is the Card Type Information Used in the Visa System?
Card type information is used in card schemes such as MasterCard, Visa, and TROY. The card types and card type codes used in the Visa system include Credit, Prepaid, Debit, Deferred Debit, and Charge Card.
Payment Systems
Preventing Financial Losses in Payment Systems: Authorization, Clearing, and the Reversal Mechanism
Every payment transaction completes in seconds, yet dozens of controls run behind the scenes. This post covers the precautions for authorization and clearing, the critical role of reversals, and the financial loss scenarios most often seen in the field.
Laws & Regulations
What are the regulations and legal obligations of payment institutions?
A payment institution is a legal entity that provides payment services for electronic payments through the infrastructure it offers. This article covers the Turkish regulatory framework, licensing, safeguarding, supervision, penalties and taxation.