To authorize, use this code:

<?php
require('RestClient.php');
//You can download this file from here https://cdn.dataforseo.com/v3/examples/php/php_RestClient.zip

try {
    //Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access
    $client = new RestClient('https://api.dataforseo.com/', null, 'login', 'password');

    //do something

} catch (RestClientException $e) {
    echo "\n";
    print "HTTP code: {$e->getHttpCode()}\n";
    print "Error code: {$e->getCode()}\n";
    print "Message: {$e->getMessage()}\n";
    print  $e->getTraceAsString();
    echo "\n";
    exit();
}
?>

            

from client import RestClient
#You can download this file from here https://cdn.dataforseo.com/v3/examples/python/python_Client.zip

#Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access
client = RestClient("login", "password")

#do something

        

            

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;

namespace DataForSeoDemos
{
    public static partial class Demos
    {
        public static async Task cmn_key_id()
        {
            var httpClient = new HttpClient
            {
                BaseAddress = new Uri("https://api.dataforseo.com/"),

                //Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access
                DefaultRequestHeaders = { Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes("login:password"))) }
            };

            // do something
        }
    }
}

        

Instead of ‘login’ and ‘password’ use your credentials from https://app.dataforseo.com/api-access