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Copyright © 1997 Andrew Marshall

This is NOT the complete standard. You must obtain this from ISO. This is a summary that I use when teaching financial system messaging, and am asked for on a frequent basis.

There are many different implementations of ISO8583, any many local variations. Fields applicable to the ISO standard are identified as 'True' in the standard column.

Message types

ISO8583 message number Description 0100 Authorisation request 0101 Authorisation request repeat 0102 Authorisation completion confirmation 0103 Authorisation completion confirmation repeat 0110 Authorisation request response 0112 Authorisation completion response 0120 Authorisation advice 0121 Authorisation advice repeat 0122 Authorisation advice completion confirmation 0123 Authorisation advice completion confirmation rpt 0130 Authorisation advice response 0132 Authorisation advice completion response 0200 Financial Transaction request 0201 Financial Transaction request repeat 0202 Financial transaction completion confirmation 0203 Financial transaction completion confirmation rpt 0210 Financial transaction request response 0212 Financial transaction completion response 0220 Financial transaction advice 0221 Financial transaction advice repeat 0222 Financial transaction advice completion confirmati 0223 Financial txn advice completion confirmation rpt 0230 Financial txn advice response 0232 Financial txn advice completion response 0300 Acquirer file update request 0302 Card issuer file update request 0310 Acquirer file update request response 0312 Card issuer file update request response 0320 Acquirer file update advice 0322 Card issuer file update advice 0330 Acquirer file update advice response 0332 Card issuer file update advice response 0400 Acquirer reversal request 0401 Acquirer reversal request response 0402 Card issuer reversal request 0403 Card issuer reversal request repeat 0410 Acquirer reversal request response 0412 Card issuer reversal request response 0420 Acquirer reversal advice 0421 Acquirer reversal advice repeat 0422 Card issuer reversal advice 0423 Card issuer reversal advice repeat 0430 Acquirer reversal advice response 0432 Card issuer reversal advice response 0500 Acquirer reconciliation request 0501 Acquirer reconciliation request repeat 0502 Card issuer reconciliation request 0503 Card issuer reconciliation request repeat 0510 Acquirer reconcilaition request response 0512 Card issuer reconciliation request response 0520 Acquirer reconciliation advice 0521 Acquirer reconciliation advice repeat 0522 Card issuer reconciliation advice 0523 Card issuer reconciliation advice repeat 0530 Acquirer reconciliation advice response 0532 Card issuer reconciliation advice response 0600 Administrative request 0601 Administrative request repeat 0610 Administrative request response 0620 Administrative advice 0621 Administrative advice repeat 0630 Administrative advice response 0800 Network management request 0801 Network management request repeat 0810 Network management request response 0820 Network management advice 0821 Network management advice repeat 0830 Network management advice response

 Bit position values

ISO BIT Num Field Name Data-type Length Format Full description ISO8583 (1987) standard 1 Bit Map Extended h 16 Secondary bit map indicating the presence or absence of bits in range 65-128 in the message being transmitted. TRUE 2 Primary account number (PAN) n 19 LLVAR Customer PAN, used to route messages. TRUE 3 Precessing code n 6 Define the transaction type 3x2 digit fields. 1&2=type of trans, 3&4=type of account, 5&6=to account (zeroes) TRUE 4 Amount, transaction n 12 Transaction amount in (lowest unit local currency) at the acquirer. TRUE 5 Amount, Settlement n 12 TRUE 6 Amount, cardholder billing n 12 Amount in (lowest unit local currency) of amount to be debited from the account held by the issuer. TRUE 7 Transmission date & time n 10 mmddhhmmss Message transmission date and time in GMT. Switch completes this field. TRUE 8 Amount, Cardholder billing fee n 8 TRUE 9 Conversion rate, Settlement n 8 TRUE 10 Conversion rate, cardholder billing n 8 Conversion rate applied to forex txn amount. format ABBBBBBB where A is the decimal point position from the right and B is the conversion factor which when multiplied by field 4 gives field 6. TRUE 11 Systems trace audit number n 6 Sequence number assigned by message originator. Stays Unchanged through txn life. TRUE 12 Time, Local transaction n 6 hhmmss Time of the local transaction TRUE 13 Date, Local transaction n 4 mmdd Date of the local transaction TRUE 14 Date, Expiration n 4 yymm Card expiration date TRUE 15 Date, Settlement n 4 mmdd Date of settlement TRUE 16 Date, conversion n 4 mmdd TRUE 17 Date, capture n 4 mmdd TRUE 18 Merchant type n 4 Category code of merchant acquirer. Auth transactions only. TRUE 19 Acquiring institution country code n 3 Country code of acquiring institution TRUE 20 PAN Extended, country code n 3 TRUE 21 Forwarding institution. country code n 3 TRUE 22 Point of service entry mode n 3 PIN/PAN entry mode. Format PPN where PP=Pos entry mode and N=PIN entry mode. TRUE 23 Application PAN number n 3 Identifies and differentiates cards with the same PAN TRUE 24 Network International identifier n 3 TRUE 25 Point of service condition code n 2 Condition under which the transaction takes place at POS. Various values. TRUE 26 Point of service capture code n 2 Maximum number of PIN digits supported. TRUE 27 Authorising identification response length n 1 TRUE 28 Amount, transaction fee n 8 TRUE 29 Amount. settlement fee n 8 TRUE 30 Amount, transaction processing fee n 8 TRUE 31 Amount, settlement processing fee n 8 TRUE 32 Acquiring institution identification code n 11 LLVAR Code identifying the acquirer TRUE 33 Forwarding institution identofication code n 11 LLVAR TRUE 34 Primary account number, extended n 28 LLVAR TRUE 35 Track 2 data z 37 LLVAR Information encoded on track 2 of the magstripe card TRUE 36 Track 3 data n 104 LLLVAR TRUE 37 Retrieval reference number an 12 Data for matching original txn Julian date+term sequence TRUE 38 Authorisation identification response an 6 Authorisation ID assigned by authorising institution TRUE 39 Response code an 2 Dispositi