OkHttpClient client = new OkHttpClient().newBuilder().build();
  MediaType mediaType = MediaType.parse("application/javascript");
  RequestBody body = RequestBody.create(mediaType, "{ "doc_type":'image', "doc_base64": '< base64 string of document >',"req_id": '< req id string >', "category": '< string >' }");
  Request request = new Request.Builder()
	.url("{{url}}/api/v1/invoice")
	.method("POST", body)
	.addHeader("token", "< your private token >")
	.addHeader("content-type", "application/json")
	.build();
  Response response = client.newCall(request).execute();

require "uri"
require "net/http"
url = URI("{{url}}/api/v1/invoice")
https = Net::HTTP.new(url.host, url.port)
https.use_ssl = true
request = Net::HTTP::Post.new(url)
request["token"] = "< your private token >"
request["content-type"] = "application/json"
request.body = "{"doc_type":'image', "doc_base64": '< base64 string of document >',"req_id": < req id string >, "category": '< string >'  }"
response = https.request(request)
puts response.read_body

CURL *curl;
CURLcode res;
curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "POST");
  curl_easy_setopt(curl, CURLOPT_URL, "{{url}}/api/v1/invoice");
  curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
  curl_easy_setopt(curl, CURLOPT_DEFAULT_PROTOCOL, "https");
  struct curl_slist *headers = NULL;
  headers = curl_slist_append(headers, "token: < your private token >");
  headers = curl_slist_append(headers, "content-type: application/json");
  curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
  const char *data = "{"doc_type":'image', "doc_base64": '< base64 string of document >',"req_id": < req id string > , "category": '< string >' }";
  curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
  res = curl_easy_perform(curl);
}
curl_easy_cleanup(curl);
																					

var request = require('request');
var options = {
  'method': 'POST',
  'url': '{{url}}/api/v1/invoice',
  'headers': {
	'token': '< your private token >',
	'content-type':'application/json'
  },
  body: '{"doc_type":"image", "doc_base64": "< base64 string of document >","req_id": < req id string > , "category": '< string >' }'
	};
	request(options, function (error, response) {
	if (error) throw new Error(error);
console.log(response.body);
});

var client = new RestClient("{{url}}/api/v1/invoice");
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AddHeader("token", "< your private token >");
request.AddHeader("content-type", "application/json");
var body = @"{" + "" +
@"    "doc_type": 'image'," + "" +
@"    "doc_base64": '< base64 string of document >'," + "" +
@"    "req_id": < req id string >" + "" +
@"    "category": < string >" + "" +
@"  }";
request.AddParameter("application/json", body,  ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);

<?php
require_once 'HTTP/Request2.php';
$request = new HTTP_Request2();
$request->setUrl('{{url}}/api/v1/invoice');
$request->setMethod(HTTP_Request2::METHOD_POST);
$request->setConfig(array(
'follow_redirects' => TRUE
));
$request->setHeader(array(
  'token' => '< your private token >',
  'content-type' => 'application/json'
));
$request->setBody('{"doc_type":"image", "doc_base64": "< base64 string of document >","req_id": < req id string > , "category": '< string >'  }');
try {
  $response = $request->send();
  if ($response->getStatus() == 200) {
	echo $response->getBody();
  }
  else {
	echo 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
	$response->getReasonPhrase();
  }
}
catch(HTTP_Request2_Exception $e) {
  echo 'Error: ' . $e->getMessage();
}
?>

use Data::Dumper;
use WWW::SwaggerClient::Configuration;
use WWW::SwaggerClient::DefaultApi;
my $api_instance = WWW::SwaggerClient::DefaultApi->new();
my $body = WWW::SwaggerClient::Object::V1_lengthofstayprediction_body->new(); # V1_lengthofstayprediction_body | 
my $token = token_example; # String | 
eval { 
	my $result = $api_instance->apiV1LengthOfStayPredictionPost(body => $body, token => $token, content-type=>'application/json');
	print Dumper($result);
};
if ($@) {
	warn "Exception when calling DefaultApi->apiV1LengthOfStayPredictionPost: $@";
}
																				

import requests
url = "{{url}}/api/v1/invoice"
payload = {"doc_type":"image", "doc_base64": "< base64 string of document >", "req_id": < req id string > , "category": '< string >' }
headers = {
  'token': '< your private token >',
  'content-type':'application/json'
}
response = requests.request("POST", url, json=payload, headers=headers)
print(response.text)