If you want to add an auth code via an API integration the Authcode needs to be inserted as a decimal value, that value will be converted to a Hex value so the keybox can read it.
Example:
[
{
"Username": "AUTHCODE",
"Firstname": "AUTHCODE",
"Lastname": "TEST",
"PinCode": "",
"AllowUserChangePinCode": true,
"UseCardAuth": true,
"UserType": 0,
"AuthCodes": [
"12345678"
],
"Email": "",
"Telephone": "",
"Cellular": "",
"Service": "",
"Department": "",
"Active": true,
"Comment": "",
"SendNotifications": true
}
]