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SchemeLens

ISO 8583:1987 response code

31

Bank not supported by switch

Standard version
ISO 8583:1987
Paired version code
ISO 8583:1993 · 905

In ISO 8583:1987, response code 31 means “Bank not supported by switch”. It is paired here with ISO 8583:1993 response code 905, “Acquirer not supported by switch”. No reviewed scheme source contains a corresponding entry on this row, so all five scheme columns are shown as N/A.

Merchant handling

Actions to be taken

Do not complete the transaction. Ask for corrected payment details or another payment method, and submit a new authorization only when the cause has been resolved and the acquirer’s rules allow it.

This is conservative merchant guidance derived from the published response meaning. Current scheme, acquirer, processor, merchant advice, and transaction-specific rules take precedence.

Scheme comparison

Descriptions in the reviewed sources

Each populated value links to its scheme record and preserves the raw code published by that source. N/A means no matching description exists in the reviewed public dataset.

Scheme descriptions compared with ISO 8583:1987 response code 31
SchemeRaw codeSource descriptionEvidence
VisaN/AN/AN/A
MastercardN/AN/AN/A
American ExpressN/AN/AN/A
DiscoverN/AN/AN/A
UnionPayN/AN/AN/A

Standard sources

Version and response-name evidence