using RestSharp;


var options = new RestClientOptions("http://localhost:56350/api/v1/Agents/EMail/GetEmailAppointment");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddJsonBody("{\n  \"MailItemId\": 123\n}", false);
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({MailItemId: 123})
};

fetch('http://localhost:56350/api/v1/Agents/EMail/GetEmailAppointment', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "56350",
  CURLOPT_URL => "http://localhost:56350/api/v1/Agents/EMail/GetEmailAppointment",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'MailItemId' => 123
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

import requests

url = "http://localhost:56350/api/v1/Agents/EMail/GetEmailAppointment"

payload = { "MailItemId": 123 }
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({MailItemId: 123})
};

fetch('http://localhost:56350/api/v1/Agents/EMail/GetEmailAppointment', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "Appointment": {
    "AppointmentId": 123,
    "StartDate": "2023-11-07T05:31:56Z",
    "EndDate": "2023-11-07T05:31:56Z",
    "Type": "Unknown",
    "Task": "<string>",
    "AssociateFullName": "<string>",
    "ContactName": "<string>",
    "Description": "<string>",
    "PersonFullName": "<string>",
    "PersonId": 123,
    "ContactId": 123,
    "ProjectId": 123,
    "ProjectName": "<string>",
    "IsPublished": true,
    "AssociateId": 123,
    "ColorIndex": 123,
    "IsFree": true,
    "HasAlarm": true,
    "IsAlldayEvent": true,
    "Private": "Public",
    "PriorityId": 123,
    "PriorityName": "<string>",
    "TaskType": "Unknown",
    "IsBookingMain": true,
    "IsRecurrence": true,
    "IsBooking": true,
    "ActiveDate": "2023-11-07T05:31:56Z",
    "AssignmentStatus": "Unknown",
    "InvitationStatus": "Unknown",
    "BookingType": "Unknown",
    "Completed": "Unknown",
    "RecurringPattern": "Unknown",
    "RecurringStartDate": "2023-11-07T05:31:56Z",
    "RecurringEndDate": "2023-11-07T05:31:56Z",
    "MotherId": 123,
    "AssignedBy": 123,
    "AssignedByFullName": "<string>",
    "RejectReason": "<string>",
    "Location": "<string>",
    "AlarmLeadTime": "<string>",
    "SaleId": 123,
    "SaleName": "<string>",
    "AssociateName": "<string>",
    "CreatedDate": "2023-11-07T05:31:56Z",
    "CreatedBy": "<string>",
    "CreatedByFullName": "<string>",
    "CreatedByAssociateId": 123,
    "CautionWarning": "OK",
    "OwnedExternally": "None",
    "MotherAssociateId": 123,
    "JoinVideomeetUrl": "<string>",
    "PreferredTZLocation": 123,
    "Title": "<string>",
    "Agenda": "<string>",
    "InternalNotes": "<string>",
    "TaskId": 123,
    "TableRight": {
      "Mask": "<string>",
      "Reason": "<string>"
    },
    "FieldProperties": {}
  },
  "CalMethod": "Unknown",
  "Participants": [
    "<string>"
  ],
  "Comment": "<string>",
  "Sequence": 123,
  "DtStart": "2023-11-07T05:31:56Z",
  "DtEnd": "2023-11-07T05:31:56Z",
  "Superseded": true,
  "TableRight": {
    "Mask": "<string>",
    "Reason": "<string>"
  },
  "FieldProperties": {}
}