Unassign Device To User Account

public AuthServerResponse UnassignDevice(string authServerPartnerLoginName, 
                 string authServerPartnerLoginPassword, 
                 string authServerPartnerUserLoginName, 
                 string printedSerialNumber)
             

AuthServerResponse  resp = UnassignDevice("accountLogin",             
            "accountKey", 
            "Mandy", 
            "OATH_1234567");         

 if (resp.ErrorCode != 0)  {      
       message.Text = resp.ErrorMsg;
       return false;
 }

 {  
  "username": "Mandy",
  "spAccountLoginName": "accountLogin",
  "spAccountLoginKey": "accountKey",
  "type": "unassign_device",
  "psn": "OATH_1234567"
 }

 {
  "errorCode": 0,
  "errorMessage": "OK",
  "type": "unassign_device"
}