ISO 8583
ISO 8583 Field Descriptions (F52)
DE 52 — Personal Identification Number (PIN) Data: the field that holds the PIN data. PIN verification is carried out based on this field.
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ISO 8583
ISO 8583 Field Descriptions (F13)
DE 13 — Date, Local Transaction: the date on which the transaction took place at the point of transaction (ATM, POS). It is 4 digits in MMDD format.
ISO 8583
ISO 8583 Field Descriptions (F7)
F7 - TRANSMISSION DATE AND TIME: the field containing the moment the initiating party started the transaction. It is a 10-character numeric value in MMDDhhmmss format.
ISO 8583
ISO 8583 Field Descriptions (F47)
F47-ADDITIONAL DATA (NATIONAL) is the field reserved for domestic additional information. In Turkey, it carries the BKM Unique ID in authorization transactions and data specific to KKPT (card-to-card transfer) transactions.
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.
Merchant & POS
What Are the Partial Authorization Requirements for an Acquirer Bank?
Partial authorization lets an issuer approve part of the requested amount when the card lacks the full balance, with the rest paid another way. This post covers the technical, receipt, clearing, reconciliation, merchant and certification requirements for acquirers.
ISO 8583
ISO 8583 Field Descriptions (F12)
DE 12-TIME, LOCAL TRANSACTION: the local time at which the transaction took place at the point of transaction (ATM, POS). 6 digits, hhmmss format. F12 differs from F7 (Transmission Date and Time).
ISO 8583
ISO 8583 Field Descriptions (F34)
F34 — Primary Account Number, Extended: this field is filled when the card number cannot be placed in F2 because it is longer than 19 digits or contains special characters.
ISO 8583
ISO 8583 Field Descriptions (F54)
F54 - ADDITIONAL AMOUNTS is the additional amount field used in transactions. It can take different values depending on the transaction, such as carrying account balance information for balance inquiries.
ISO 8583
ISO 8583 Field Descriptions (F45)
F45 (TRACK-1 DAT) carries the Track 1 data of the card in ISO 7813 format, including field separators and start and end sentinels but excluding the LRC character. It is 76 characters long.
ISO 8583
ISO 8583 Field Descriptions (F37)
F37-RETRIEVAL REFERENCE NUMBER is a code generated by the bank that initiates a transaction, used to uniquely track it. It is a 12-character alphanumeric value.
ISO 8583
ISO 8583 Field Descriptions (F4, F5, F6, F49, F50, F51)
Fields F4, F5, F6, F49, F50, and F51 are the Amount and Currency fields sent in the authorization message. For example, for a 300 Euro transaction, the amount and currency information sent in these fields is as follows.