Elavon ISO Protocol (EISOP)

This document defines an ISO8583 based message protocol for use by customers / partners of Elavon Merchant Services for the transmission of financial transaction messages.

The method of reconciliation used for a given implementation will be decided upon based on discussions between Elavon and the partner that proposes to integrate with the Elavon acquiring host system.

One method of operation is for integrators to operate in dual message mode where approved authorisations are stored on the partner’s POS terminals or acquiring host system once the transaction is approved. The partner will then create and transmit a submission file to Elavon to effect merchant funding and cardholder debiting. In this document, such a method of operation will be referred to as a dual message solution.

An alternative method of operation is for the Elavon acquiring host to capture and store approved authorisations for subsequent customer funding and cardholder debiting. This will require the partner host system to accumulate batch totals per terminal and send on-line reconciliation requests to the Elavon host. In this document, such a method of operation will be referred to as a single message solution.

The Elavon ISO Protocol supports the following authorisation related transactions:

  • Sales
  • Refunds
  • Sale reversals
  • ‘Force posts’ following referral and voice authorisation
  • Dynamic Currency Conversion (DCC) quote rejections (legacy system support only)
  • Pre-authorisation requests
  • Incremental Pre-authorisation
  • Pre-authorisation completion requests
  • Pre-authorisation reversal
  • Incremental Pre-authorisation reversal
  • DCC Inquiry Requests

The protocol also supports:

  • Exchange rate downloads (for DCC)
  • Reconciliation request messages
  • Network management messages

The following ISO message types are used:

Transaction Description
Request MTI
Response MTI

Pre-authorisations / Incremental Pre-Authorisations

1100

1110

Sales

1200

1210

Pre-Authorisation Completions

1200

1210

Refunds / Force / DCC Quote Rejections (including repeats)

1220/1

1230

Sale Reversals (including repeats)

1420/1

1430

Exchange Rate Requests

1304

1314

DCC Inquiry Requests

1305

1315

Reconciliation / Batch Closure

1500

1510

Network Management

1804

1814

Notes:

  • Repeat message processing is only supported for 1220 and 1420 message types.
  • A maximum number of three repeat messages for a corresponding advice (1X20) message will be accepted by the Elavon acquiring host.
  • Chip data is not required for Visa Incremental transactions.