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"F39 field"

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Diagram illustrating the ISO 8583 F39 response code field

ISO 8583

ISO 8583 Field Descriptions (F39)

F39 - RESPONSE CODE: This is the code showing whether the transaction was approved or declined. It is 2-digit alphanumeric. Typically 00 is sent when approved, and a decline reason code is sent when declined.

ISO 8583 field table showing the F38 authorization identification response field

ISO 8583

ISO 8583 Field Descriptions (F38)

DE 38 (AUTHORIZATION IDENTIFICATION RESPONSE) is the authorization code generated when a transaction is approved. It is alphanumeric, 6 characters long, and left empty for declined transactions.

Table showing payment system response code values that indicate transaction approval

Online & Authorization

What Are the Response Code Values That Mean Approval?

In payment systems, the result of a transaction is sent in the F39 field. The F39 value is the code indicating the transaction's approval or decline status. It is a 2-character alphanumeric code. When approved, the value is usually 00.

POS terminal device used for processing card transactions

Online & Authorization

Response Codes That Can Be Received in Offline Transactions

Below are the possible response code values for offline transactions and their explanations: Response Code / Explanation - Y1: Approved offline, Z1: Declined offline, Y2: Approved after referral, and more.