I tried to read visa card details.Using EMV response I can't get value for tag 57 to get PAN and Expire date.please can you help me because I am new to this.Thank you.
Why I can't get TLV tag value for 57 by using EMV response?
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Tag '57' is the Track 2 Equivalent Data, the PAN is individually stored in tag '5A'.
Anyway, in both cases, these tags can't be read using the GET DATA command, they are stored in records that can be retrieved using the READ RECORD command.
To know what records to read, you need to parse the Application File Locator (AFL, tag '94') received in the response to the GET PROCESSING OPTIONS command.
Let me know if you have other questions.
Hear is an example:
Select Visa application
GPO
Read record 2 of SFI 1
Read record 1 of SFI 3
Read record 2 of SFI 3