emvlab.org
Updates in June 2017: For more details on updates to EMVLab, including HTTPS and better handling of 3-byte and unknown tags see my blog post.
Name Description Source Format Template Tag Length P/C
Card Status Update (CSU) Contains data sent to the ICC to indicate whether the issuer approves or declines the transaction, and to initiate actions specified by the issuer. Transmitted to the card in Issuer Authentication Data. Issuer b 4

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