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I have a problem sending IAD format 2 with biometric authentication. I work with a payment terminal and he only accept my IAD when his size is under 23 bytes (like a format 1 IAD) and I don't find where I can specify the format version.

Thank you

Nifim
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Axel
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1 Answers1

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From Visa online ( you need to have access ), download Visa Contactless Payment Specification (VCPS) Visa Supplemental Requirements

and refer section. M Issuer Application Data (IAD) and Card Verification Results (CVR) Formats

Length of any TLV object is processed as per below rule. enter image description here

Adarsh Nanu
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  • I found out the problem, actually my transaction is blocked because my gpo response is too long. I can't send a response with more than 127 bytes. I don't understand where could I change the maximum length of the response or if I need to change something else. – Axel Jul 21 '22 at 15:02
  • Edited the answer, maybe that helps, or else I will delete the answer if no relevance. – Adarsh Nanu Jul 21 '22 at 17:26