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Elavon ISO Protocol (EISOP)
Data Encoding and Representation
Important Message Fields
Authorisation Message Format
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
Appendix A: Message Authentication Code (MAC) Generation and Validation
Appendix B: Protocol Ports
Appendix C: Product Codes
Revision History

Field 51: Cardholder Billing Currency Code

Format: n3

Description: ISO 4217 numeric currency code of the transaction amount specified in Field 6.

Required for Multi-Currency Processing (MCP).

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Copyright© 2023 | Elavon Financial Services DAC. Registered in Ireland – Number 418442.

Registered Office: Block F1, Cherrywood Business Park, Dublin 18, D18 W2X7, Ireland

Elavon Financial Services DAC, trading as Elavon Merchant Services, is regulated by the Central Bank of Ireland.

Elavon Financial Services DAC. Registered in Ireland with Companies Registration Office. The liability of the member is limited. United Kingdom branch registered in England and Wales under the number BR022122.

Elavon Financial Services DAC, trading as Elavon Merchant Services, is deemed authorised and regulated by the Financial Conduct Authority. Details of the Temporary Permissions Regime, which allows EEA-based firms to operate in the UK for a limited period while seeking full authorisation, are available on the Financial Conduct Authority’s website.