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An Electronic Commerce Indicator (ECI) is a response code used in 3D Secure transactions, specifically in EMV 3D Secure. It helps merchants determine the next steps to take in a transaction — proceed, reject the purchase, or try again. Below you will find the possible responses and ECI values you can receive.

Successful authentication

The card issuer has successfully verified the cardholder’s identity and validated the EMV 3Ds protocol. Consequently, the transaction is authorized to proceed, and all parties can benefit from the security and safeguards provided by 3DS.
Card typeECI indicator
Visa Secure05
Mastercard IdentityCheck02
JC J/Secure 2.005
American Express SafeKey 2.005
Discover ProtectBuy 2.005
Elo 3DS05
eftpos*05
Carte Bancaires Fast’r05 / 02
UnionPay International*05 / 02
ITMX (LSS) Local Switch Secure05 / 02

Attempted authentication

The issuer’s authentication service is currently unavailable. A merchant will receive this message when the customer is not enrolled in 3DS. This response serves as evidence that the merchant attempted authentication and fulfilled their due diligence as required by 3DS regulations.
Card typeECI indicator
Visa Secure06
Mastercard IdentityCheck01
JC J/Secure 2.006
American Express SafeKey 2.006
Discover ProtectBuy 2.006
Elo 3DS06
eftpos*06
Carte Bancaires Fast’r06 / 01
UnionPay International*06 / 01
ITMX (LSS) Local Switch Secure06 / 01

Failed authentication

The issuer encountered challenges and could not authenticate the cardholder due to various factors. These may include instances where incorrect information was provided during the authentication process or when the cardholder themselves chose to cancel the authentication page. Other unspecified reasons could also contribute to the issuer’s inability to complete the authentication successfully.
Card typeECI indicator
Visa Secure07
Mastercard IdentityCheck00
JC J/Secure 2.007
American Express SafeKey 2.007
Discover ProtectBuy 2.007
Elo 3DS07
eftpos*07
Carte Bancaires Fast’r07 / 00
UnionPay International*07 / 00
ITMX (LSS) Local Switch Secure07 / 00

Not permitted authentication

The authentication request encountered obstacles that prevented its completion for various reasons. These reasons may include the exclusion of the card type from authentication attempts, the inability of the ACS (Access Control Server) to process the authentication request message or other unspecified factors. As a result, the authentication process could not be allowed to proceed.
Card typeSupported Version(s)
Visa Secure07
Mastercard IdentityCheck00
JC J/Secure 2.007
American Express SafeKey 2.007
Discover ProtectBuy 2.007
Elo 3DS07
eftpos*07
Carte Bancaires Fast’r07 / 00
UnionPay International*07 / 00
ITMX (LSS) Local Switch Secure07 / 00

Although cobranded, transactions made through eftpos will receive ECI codes of 05/06/07, indicating the possible outcomes of authentication attempts. UnionPay International: Transactions falling within the BIN ranges overlapping with UnionPay International will receive both ECI values - 05/06/07 and 02/01/00. These values signify different authentication results.