curl --request POST \
  --url https://petstore3.swagger.io/api/v3/user \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 10,
  "username": "theUser",
  "firstName": "John",
  "lastName": "James",
  "email": "john@email.com",
  "password": "12345",
  "phone": "12345",
  "userStatus": 1
}
'

import requests

url = "https://petstore3.swagger.io/api/v3/user"

payload = {
    "id": 10,
    "username": "theUser",
    "firstName": "John",
    "lastName": "James",
    "email": "john@email.com",
    "password": "12345",
    "phone": "12345",
    "userStatus": 1
}
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({
    id: 10,
    username: 'theUser',
    firstName: 'John',
    lastName: 'James',
    email: 'john@email.com',
    password: '12345',
    phone: '12345',
    userStatus: 1
  })
};

fetch('https://petstore3.swagger.io/api/v3/user', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://petstore3.swagger.io/api/v3/user",
  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([
    'id' => 10,
    'username' => 'theUser',
    'firstName' => 'John',
    'lastName' => 'James',
    'email' => 'john@email.com',
    'password' => '12345',
    'phone' => '12345',
    'userStatus' => 1
  ]),
  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;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://petstore3.swagger.io/api/v3/user"

	payload := strings.NewReader("{\n  \"id\": 10,\n  \"username\": \"theUser\",\n  \"firstName\": \"John\",\n  \"lastName\": \"James\",\n  \"email\": \"john@email.com\",\n  \"password\": \"12345\",\n  \"phone\": \"12345\",\n  \"userStatus\": 1\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://petstore3.swagger.io/api/v3/user")
  .header("Content-Type", "application/json")
  .body("{\n  \"id\": 10,\n  \"username\": \"theUser\",\n  \"firstName\": \"John\",\n  \"lastName\": \"James\",\n  \"email\": \"john@email.com\",\n  \"password\": \"12345\",\n  \"phone\": \"12345\",\n  \"userStatus\": 1\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://petstore3.swagger.io/api/v3/user")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"id\": 10,\n  \"username\": \"theUser\",\n  \"firstName\": \"John\",\n  \"lastName\": \"James\",\n  \"email\": \"john@email.com\",\n  \"password\": \"12345\",\n  \"phone\": \"12345\",\n  \"userStatus\": 1\n}"

response = http.request(request)
puts response.read_body

{
  "id": 10,
  "username": "theUser",
  "firstName": "John",
  "lastName": "James",
  "email": "john@email.com",
  "password": "12345",
  "phone": "12345",
  "userStatus": 1
}

{
  "code": "<string>",
  "message": "<string>"
}