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Once a key needs to be renewed (the renewal interval will be discussed during project setup, a Cortina RenewKey request will be sent. The Request will include all the details of the current key in the CurrentKeyData object. The Payment Gateway should send the new key data in the NewKeyData object of the response, as in the example below: 
"NewKeyData": {
    "EncryptedKeyValue": "D0112P0AB01N00008C27C2DD44ACF35513DCA16B10B7FB9AD47550091AF4FF37C01002E5BA04A1D05057291A4B0EBCA6EE46940224BCE55F",
    "Kcv": "BC4012",
    "ExternalKeyId": "376",
    "additionalProperties": {}
  }
Where:
  • EncryptedKeyValue = the encrypted Key Value, encrypted with the ZMK shared.
  • Kcv = the new Key Check value (content is bytes)
  • ExternalKeyId = The new External Key ID in the payment gateway system.