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Elavon ISO Protocol (EISOP)
Data Encoding and Representation
Important Message Fields
Reconciliation Number – Field 29
Acquiring Institution ID Code – Field 32
Approval Code – Field 38
Terminal ID Code – Field 41
Additional Private Data – Field 48
Authorisation Message Format
1100 / 1110 Messages – Pre-Authorisations
1200 / 1210 Messages – Sale / Completions
1220 / 1230 Messages – Refunds / Force
Reversal Message Format
Conversion Rate Message Formats
1304 / 1314 Messages – DCC Rate Requests
1305 / 1315 Messages – DCC Inquiry Request
Reconciliation Message Format
1500 / 1510 Messages – Reconciliations
Network Management Message Format
Summary of Field Usage
Field Descriptions
Message Length
Message Type Indicator (MTI)
Bitmap Primary
Bitmap Secondary
Field 2: PAN
Field 3: Processing Code
Field 4: Transaction Amount
Field 6: Cardholder Billing Amount
Field 10: Conversion Rate
Field 11: System Trace Audit Number (STAN)
Field 12: Transaction Date and Time
Field 14: Expiry Date
Field 22: POS Data Code
Field 24: Function Code
Field 25: Reason Code
Field 28: Reconciliation Date
Field 29: Reconciliation Number
Field 32: Acquiring Institution ID Code
Field 35: Track 2
Field 37: Retrieval Reference Number
Field 38: Approval Code
Field 39: Response Code
Field 41: Card Acceptor Terminal Identification
Field 42: Card Acceptor Merchant ID
Field 43: Payment Facilitator / Card Acceptor Location Name and Address
Field 44: Additional Response Data
Field 48: Additional Private Data
Field 49: Transaction Currency Code
Field 50: Reconciliation Currency Code
Field 51: Cardholder Billing Currency Code
Field 52: PIN Data
Field 53: Security Related Control Information
Field 54: Amount, Other
Field 55: ICC Data
Field 60: Reserved Private Data
Field 63: Reserved Private Data III
Field 64: MAC
Field 74: Number of Refunds
Field 75: Number of Cancelled Sales
Field 76: Number of Sales
Field 77: Number of Cancelled Refunds
Field 86: Amount of Refunds
Field 87: Amount of Cancelled Sales
Field 88: Amount of Sales
Field 89: Amount of Cancelled Refunds
Field 97: Reconciliation Net Amount
Appendix A: Message Authentication Code (MAC) Generation and Validation
Appendix B: Protocol Ports
Appendix C: Product Codes
Revision History
Field 37: Retrieval Reference Number
Format:
an12
Description:
A unique partner transaction reference number. This value should be unique on the partner’s host system within a 24 hour period.
