curl --request POST \
  --url https://api.wsapi.chat/chats/{chatId}/messages \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --header 'X-Instance-Id: <x-instance-id>' \
  --data '
{
  "lastMessageId": "3EB0A0B0C1D2E3F4",
  "lastMessageSenderId": "1234567890",
  "count": 50
}
'

import requests

url = "https://api.wsapi.chat/chats/{chatId}/messages"

payload = {
    "lastMessageId": "3EB0A0B0C1D2E3F4",
    "lastMessageSenderId": "1234567890",
    "count": 50
}
headers = {
    "X-Instance-Id": "<x-instance-id>",
    "X-Api-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-Instance-Id': '<x-instance-id>',
    'X-Api-Key': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    lastMessageId: '3EB0A0B0C1D2E3F4',
    lastMessageSenderId: '1234567890',
    count: 50
  })
};

fetch('https://api.wsapi.chat/chats/{chatId}/messages', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

using RestSharp;


var options = new RestClientOptions("https://api.wsapi.chat/chats/{chatId}/messages");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddHeader("X-Instance-Id", "<x-instance-id>");
request.AddHeader("X-Api-Key", "<api-key>");
request.AddJsonBody("{\n  \"lastMessageId\": \"3EB0A0B0C1D2E3F4\",\n  \"lastMessageSenderId\": \"1234567890\",\n  \"count\": 50\n}", false);
var response = await client.PostAsync(request);

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

{
  "status": "ok"
}

{
  "status": 400,
  "detail": "invalid request body"
}

{
  "status": 401,
  "detail": "unauthorized"
}

{
  "status": 403,
  "detail": "device not paired"
}

{
  "status": 503,
  "detail": "instance not available"
}