Visa · NFC

Visa debit

Step through a transaction one command at a time. Every field named, every status word explained.

Taught in modules

Step 2 of 8

Response95 bytes

6F 5B 84 0E 32 50 41 59 2E 53 59 53 2E 44 44 46 30 31 A5 49 BF 0C 46 61 22 4F 07 A0 00 00 00 03 10 10 50 0A 56 49 53 41 20 44 45 42 49 54 87 01 01 42 03 40 00 00 5F 55 02 55 53 61 20 4F 07 A0 00 00 00 98 08 40 50 08 55 53 20 44 45 42 49 54 87 01 02 42 03 40 00 00 5F 55 02 55 53 90 00

Status word

Completed successfully.

Decoded objects

6FFile Control Information (FCI) Template91 bytes
- 84Dedicated File Name14 bytes
  32 50 41 59 2E 53 59 53 2E 44 44 46 30 31“2PAY.SYS.DDF01”
- A5FCI Proprietary Template73 bytes
  - BF0CFCI Issuer Discretionary Data70 bytes
    - 61Application Template34 bytes
      - 4FApplication Identifier (AID)7 bytes
        A0 00 00 00 03 10 10
      - 50Application Label10 bytes
        56 49 53 41 20 44 45 42 49 54“VISA DEBIT”
      - 87Application Priority Indicator1 byte
        01
      - 42Issuer Identification Number3 bytes
        40 00 00
      - 5F55Issuer Country Code (alpha2)2 bytes
        55 53“US”
    - 61Application Template32 bytes
      - 4FApplication Identifier (AID)7 bytes
        A0 00 00 00 98 08 40
      - 50Application Label8 bytes
        55 53 20 44 45 42 49 54“US DEBIT”
      - 87Application Priority Indicator1 byte
        02
      - 42Issuer Identification Number3 bytes
        40 00 00
      - 5F55Issuer Country Code (alpha2)2 bytes
        55 53“US”

Exercises

Answer from the capture above. The explanation is worth reading either way.

Level 1
Which Application Identifier (AID) does the card offer in its PPSE response?
Level 2
What is the Application Transaction Counter (tag 9F36) in this capture, in hex?
Level 2
The Application Interchange Profile (tag 82) on this card is 0000. Which authentication and verification capabilities does it assert?
Level 2
Which tag carries the Issuer Identification Number, and what is its relationship to the PAN?
Level 4
The Terminal Transaction Qualifiers in this session's GET PROCESSING OPTIONS data begin 32 80 40 00. Byte 2 carries the reader's CVM requirements. If this reader demanded a cardholder verification method, with every other bit left exactly as it is, what would byte 2 read?
Level 1
The terminal's very first command carries fourteen bytes of name: 325041592E5359532E4444463031. Decode them as ASCII text.
Level 1
In that same command, the fifth byte is 0E. How many bytes of data does it say follow it? Answer in decimal.
Level 1
The card's reply contains tag 50 twice. The first reads VISA DEBIT. What does the second one read?
Level 1
Tag 87 is the Application Priority Indicator. Which of the two applications does this card want the terminal to pick first? Give its label.
Level 1
Card response 4 is ten bytes: 700A5F280208409F0702C080. Find the issuer country code and give its value.
Level 1
When the terminal starts the transaction, the card answers with an Application Interchange Profile in tag 82. What are its two bytes?

Where this capture is taught

Every module below practices on this exact capture.

Decode your own bytes

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