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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.

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.