![]() For example, if DE 55 is an LLVAR field, you'll need to add the overall length of the EMV data as LL in DE 55 before putting in all the EMV data.īelow is an example of DE 55 in an ISO-8583 message. Your ARPC cryptogram in the Tag 91: Issuer Authentication Data seems wrong as it having 00 00. If someone could provide insight into what's happening or what's going wrong, I would greatly appreciate it. In case tag 0x8A is unknown it can be taken from tag 0x91, but only for some Card Brands/profiles. As you can see the when second generate AC, it shows that MChip4 - Symbol 81: Issuer Authentication failed, declining transaction. Web I investigated this problem in past and here are the results. The only extra stuff that you might need will be the length/ encoding required by the ISO-8583 variant you are implementing. EMV Tag 91 Issuer Authentication Data - Stack Overflow. Secondly, once you know the encoding itself, it's just a matter of putting all tags together one after another and you get your DE 55-no delimiters and no meta information it's as simple as that. Well, firstly, one needs to know that EMV tags are BER-TLV encoded in Field 55. DE 55, also called Field 55, in ISO-8583 is Integrated Chip Data so, it's easy to deduce that the EMV tags of an online transaction should be put in DE 55 when creating the corresponding ISO-8583 financial transaction message. ![]()
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