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Nayax will send the encrypted PIN Block in the Authorization\Sale request under the DukptInfo object as in the example below: 
"DukptInfo": {
    "Algorithm": 1,
    "PINBlock": "xxxxxxxx",
    "PINBlockFormat": 48,
    "ExternalKeyId": "372"}
Where:
  • Algorithm = the algorithm used for encryption.
    • 1: TDEA
    • 2: 2TDEA
    • 3: AES-128
    • 4: AES-256
    • 5: 3TDEA
  • PINBlock = The encrypted PIN Block
  • PINBlockFormat = The Pin block format used.
    • 1: ISO_0
    • 5: ISO_1
    • 34: ISO_2
    • 47: ISO_3
    • 48: ISO_4
  • ExternalKeyId = The external ID of the key used in a Dynamic key exchange format.