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

            

# Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access \
login="login" \
password="password" \
cred="$(printf ${login}:${password} | base64)" \
id="04171306-0696-0188-0000-98b668ecaf09" \
curl --location --request GET "https://api.dataforseo.com/v3/merchant/google/product_spec/task_get/advanced/${id}" \
--header "Authorization: Basic ${cred}"  \
--header "Content-Type: application/json" \
--data-raw ""


        

<?php
// You can download this file from here https://cdn.dataforseo.com/v3/examples/php/php_RestClient.zip
require('RestClient.php');
$api_url = 'https://api.dataforseo.com/';
// Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access
$client = new RestClient($api_url, null, 'login', 'password');

try {
   $result = array();
   // #1 - using this method you can get a list of completed tasks
   // GET /v3/merchant/google/product_spec/tasks_ready
   $tasks_ready = $client->get('/v3/merchant/google/product_spec/tasks_ready');
   // you can find the full list of the response codes here https://docs.dataforseo.com/v3/appendix/errors
   if (isset($tasks_ready['status_code']) AND $tasks_ready['status_code'] === 20000) {
      foreach ($tasks_ready['tasks'] as $task) {
         if (isset($task['result'])) {
            foreach ($task['result'] as $task_ready) {
               // #2 - using this method you can get results of each completed task
               // GET /v3/merchant/google/product_spec/task_get/advanced/$id
               if (isset($task_ready['endpoint_advanced'])) {
                  $result[] = $client->get($task_ready['endpoint_advanced']);
               }
               // #3 - another way to get the task results by id
               // GET /v3/merchant/google/product_spec/task_get/advanced/$id
               /*
               if (isset($task_ready['id'])) {
                  $result[] = $client->get('/v3/merchant/google/product_spec/task_get/advanced/' . $task_ready['id']);
               }
               */
            }
         }
      }
   }
   print_r($result);
   // do something with result
} 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";
}
$client = null;
?>

            

from client import RestClient
# You can download this file from here https://cdn.dataforseo.com/v3/examples/python/python_Client.zip
client = RestClient("login", "password")
# 1 - using this method you can get a list of completed tasks
# GET /v3/merchant/google/product_spec/tasks_ready
response = client.get("/v3/merchant/google/product_spec/tasks_ready")
# you can find the full list of the response codes here https://docs.dataforseo.com/v3/appendix/errors
if response['status_code'] == 20000:
    results = []
    for task in response['tasks']:
        if (task['result'] and (len(task['result']) > 0)):
            for resultTaskInfo in task['result']:
                # 2 - using this method you can get results of each completed task
				# GET /v3/merchant/google/product_spec/task_get/advanced/$id
                if(resultTaskInfo['endpoint_advanced']):
                    results.append(client.get(resultTaskInfo['endpoint_advanced']))                
                '''
                # 3 - another way to get the task results by id
                # GET /v3/merchant/google/product_spec/task_get/advanced/$id              
                if(resultTaskInfo['id']):
                    results.append(client.get("/v3/merchant/google/product_spec/task_get/advanced/" + resultTaskInfo['id']))
                '''
    print(results)
    # do something with result
else:
    print("error. Code: %d Message: %s" % (response["status_code"], response["status_message"])) 


        

            


const task_id = '02231453-2604-0066-2000-64d39c6677d4';

const axios = require('axios');

axios({
    method: 'get',
    url: 'https://api.dataforseo.com/v3/merchant/google/product_spec/task_get/advanced/' + task_id,
    auth: {
        username: 'login',
        password: 'password'
    },
    headers: {
        'content-type': 'application/json'
    }
}).then(function (response) {
    var result = response['data']['tasks'];
    // Result data
    console.log(result);
}).catch(function (error) {
    console.log(error);
});


        

            

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

namespace DataForSeoDemos
{
    public static partial class Demos
    {
        public static async Task merchant_google_product_spec_task_get()
        {
            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"))) }
            };
            // #1 - using this method you can get a list of completed tasks
            // GET /v3/merchant/google/product_spec/tasks_ready
            var response = await httpClient.GetAsync("/v3/merchant/google/product_spec/tasks_ready");
            var tasksInfo = JsonConvert.DeserializeObject<dynamic>(await response.Content.ReadAsStringAsync());
            var tasksResponses = new List<object>();
            // you can find the full list of the response codes here https://docs.dataforseo.com/v3/appendix/errors
            if (tasksInfo.status_code == 20000)
            {
                if (tasksInfo.tasks != null)
                {
                    foreach (var tasks in tasksInfo.tasks)
                    {
                        if (tasks.result != null)
                        {
                            foreach (var task in tasks.result)
                            {
                                if (task.endpoint_advanced != null)
                                {
                                    // #2 - using this method you can get results of each completed task
                                    // GET /v3/merchant/google/product_spec/task_get/advanced/$id
                                    var taskGetResponse = await httpClient.GetAsync((string)task.endpoint_advanced);
                                    var taskResultObj = JsonConvert.DeserializeObject<dynamic>(await taskGetResponse.Content.ReadAsStringAsync());
                                    if (taskResultObj.tasks != null)
                                    {
                                        var fst = taskResultObj.tasks.First;
                                        // you can find the full list of the response codes here https://docs.dataforseo.com/v3/appendix/errors
                                        if (fst.status_code >= 40000 || fst.result == null)
                                            Console.WriteLine($"error. Code: {fst.status_code} Message: {fst.status_message}");
                                        else
                                            tasksResponses.Add(fst.result);
                                    }
                                    // #3 - another way to get the task results by id
                                    // GET /v3/merchant/google/product_spec/task_get/advanced/$id
                                    /*
                                    var tasksGetResponse = await httpClient.GetAsync("/v3/merchant/google/product_spec/task_get/advanced/" + (string)task.id);
                                    var taskResultObj = JsonConvert.DeserializeObject<dynamic>(await tasksGetResponse.Content.ReadAsStringAsync());
                                    if (taskResultObj.tasks != null)
                                    {
                                        var fst = taskResultObj.tasks.First;
                                        // you can find the full list of the response codes here https://docs.dataforseo.com/v3/appendix/errors
                                        if (fst.status_code >= 40000 || fst.result == null)
                                            Console.WriteLine($"error. Code: {fst.status_code} Message: {fst.status_message}");
                                        else
                                            tasksResponses.Add(fst.result);
                                    }
                                    */
                                }
                            }
                        }
                    }
                }
                if (tasksResponses.Count > 0)
                    // do something with result
                    Console.WriteLine(String.Join(Environment.NewLine, tasksResponses));
                else
                    Console.WriteLine("No completed tasks");
            }
            else
                Console.WriteLine($"error. Code: {tasksInfo.status_code} Message: {tasksInfo.status_message}");
        }
    }
}


        

The above command returns JSON structured like this:

{
  "version": "0.1.20210805",
  "status_code": 20000,
  "status_message": "Ok.",
  "time": "0.0943 sec.",
  "cost": 0,
  "tasks_count": 1,
  "tasks_error": 0,
  "tasks": [
    {
      "id": "08121145-2806-0188-0000-fbe09b08b89a",
      "status_code": 20000,
      "status_message": "Ok.",
      "time": "0.0250 sec.",
      "cost": 0,
      "result_count": 1,
      "path": [
        "v3",
        "merchant",
        "google",
        "product_spec",
        "task_get",
        "advanced",
        "08121145-2806-0188-0000-fbe09b08b89a"
      ],
      "data": {
        "se_type": "shopping_specifications",
        "api": "merchant",
        "function": "product_spec",
        "se": "google",
        "language_code": "en",
        "location_code": 2840,
        "product_id": "8630889977405722046",
        "device": "desktop",
        "os": "windows"
      },
      "result": [
        {
          "product_id": "8630889977405722046",
          "type": "shopping_specifications",
          "se_domain": "google.com",
          "location_code": 2840,
          "language_code": "en",
          "title": "Apple iPhone 8 Plus - 64 GB - Silver - T-Mobile - GSM",
          "description": "iPhone 8 Plus introduces an all‐new glass design. The world's most popular camera, now even better. The smartest, most powerful chip ever in a smartphone. Wireless charging that’s truly effortless. And augmented reality experiences never before possible. iPhone 8 Plus. A new generation of iPhone.",
          "image_url": "https://encrypted-tbn0.gstatic.com/shopping?q=tbn:ANd9GcSdbgO6s2iZT4NhZC86HtsfewNrVQQqzpmebJ1y70HZR3B6wHiL-WF-aE8gFQ&usqp=CAY",
          "tags": [
            "Apple",
            "iPhone",
            "iPhone 8",
            "iPhone 8 Plus",
            "iOS",
            "5.5″",
            "Fingerprint Scanner",
            "12 MP rear camera",
            "Smartphone",
            "With Wireless Charging"
          ],
          "check_url": "https://www.google.com/shopping/product/8630889977405722046/specs?&hl=en&gl=US&gws_rd=cr&uule=w+CAIQIFISCQs2MuSEtepUEUK33kOSuTsc",
          "datetime": "2021-08-12 08:45:01 +00:00",
          "item_types": [
            "shopping_specification"
          ],
          "items_count": 3,
          "items": [
            {
              "type": "shopping_specification",
              "rank_group": 1,
              "rank_absolute": 1,
              "position": "right",
              "xpath": "/html[1]/body[1]/div[3]/div[2]/div[1]/div[1]/table[1]/tr[2]",
              "block_name": "Universal Product Identifiers",
              "specification_name": "Brand",
              "specification_value": "Apple"
            },
            {
              "type": "shopping_specification",
              "rank_group": 2,
              "rank_absolute": 2,
              "position": "right",
              "xpath": "/html[1]/body[1]/div[3]/div[2]/div[1]/div[1]/table[1]/tr[3]",
              "block_name": "Universal Product Identifiers",
              "specification_name": "Part Numbers",
              "specification_value": "364FC3802F6B4DB8A02B0E541E551BE8, A1897, I8P-64-SIL-TMO-E, I8P-64-SIL-TMO-G, I8P-64-SIL-TMO-VG, IPHONE8PLUSMQ902LLA, MQ8E2LL/A, MQ8U2LL/A, MQ912, MQ912LL/A, PH-AP-IP8000-FAC-064-PR-A1905-Z-1GFA"
            },
            {
              "type": "shopping_specification",
              "rank_group": 3,
              "rank_absolute": 3,
              "position": "right",
              "xpath": "/html[1]/body[1]/div[3]/div[2]/div[1]/div[1]/table[1]/tr[4]",
              "block_name": "Universal Product Identifiers",
              "specification_name": "GTIN",
              "specification_value": "00190198456168"
            }
          ]
        }
      ]
    }
  ]
}